I don't know if this will help, but maybe try taking a nice long shower? That's really calming for me. Another idea: try knitting, crocheting, sewing, friendship-braceleting, or something else that can keep your hands busy while not taking up much of you attention. That could act as a transition between doing nothing and always having to do something.

It sounds to me like you have a lot of energy to let out. Maybe try going for a long run, not listening to music or anything, just channel all energy and emotion into your legs, into running. If that's not enough, do more. Gymnastics, weights, swimming, whatever. Just get some energy out. And if that doesn't work, try writing. I know you've done it, but do it. Again, not listening to music. It's okay if you're not inspired. Write whatever you're thinking and let it grow. It's just an exercise, so you can write whatever you want. Write all of it. Describe the restlessness, detail every fleeting thought. If you have something eating at you, write it out. Don't stop. Wear yourself out. And if you can, go outside, lie down, and have someone cover you in pebbles. Or sand. Or I guess dirt or clay or mud. Maybe this is what mud baths are for. Weigh down your body and don't move. I've done it, with pebbles, when I was several years younger and a lot more energetic. It was relaxing. And finally, try one of the hardest things in the world: Try to not think. You heard me. No thoughts. Sit still and don't think. It's really difficult, but also fun in a peaceful way, and kind of refreshing, almost like being asleep.

I just noticed everything I've suggested is a form of meditation. So, I guess, meditate.

Thanks, both of you. You both had some great advice. (And Viola, now I'm inspired. I don't know what I'm inspired to do but I'm just overall inspired. Thanks.)

You could listen to some less violent songs of Hamilton? Or you could nap?

Or you could just lay down and think about things. (books, fandoms, writing, etc.)

Leafpool, everyone fidgets.  I'm sure you've seen fidget spinners around, but personally, they don't help me much cause it's not doing much with my hands. You might want to look into a fidget cube or a fidget ring. Both of those are good ways to fidget in a fairly quiet & unobtrusive way.

I have a similar problem! I haven't really thought about it much, but reading this, I realize that I always have to be doing something with an outcome, or else I feel like I'm wasting time. I think that's why I've almost stopped reading completely in the past year (this summer, I think I read three books. In the past, I've read 20+) I'm currently trying to stop myself from feeling like this, so I guess I can recommend activities that still give the illusion of productivity while being relaxing. For example, coloring, being on the CB/other chat rooms/texting friends/answering emails/, knitting or crocheting, baking, gardening, etc. Activities that allow you to think about other things, but have an outcome or nice end result. If that makes any sense. 

I'd also recommend doing something like running or joining a sports team! It's a great way to let all your energy out. Find a hobby where you can get in the zone. Maybe set 5 min. out of your day to try to relax, and build up from there. If you're having trouble feeling... unproductive? (This is mostly the problem I have), give your relaxation time a reason, like, 'I'm sitting here to watch the sunset'. As for the listening to music part, I listen to music almost nonstop, so that's not something to feel bad about. I think it might be a teenage phase- according to my mom, she used to always listen to music, but grew out of it. 

So, is the problem that you cannot relax or that you always have to be doing something productive? Because there are things you could do as a form of relaxation, like coloring books, knitting, friendship bracelets, or puzzles. Things like that don't really require critical thinking and you can let your mind wander and relax as you do it. You don't need to be completely stationary for relaxation. Relaxation means something different for everyone. It could be drawing or reading or hanging out with a friend. What's relaxing for one person might not be relaxing for another.

But it's different if the problem is that you can't relax at all, even when doing something that's supposed to be calming. Sometimes I have trouble going to sleep because my brain just won't quiet down. I have so many things I'd rather be doing, so many plans to make, so many ideas, that I can't fall asleep. One thing that helps is keeping a notebook by my bed and making a to-do list before I go to sleep. That helps me organize my thoughts before I lie down. I also write in my notebook if some idea strikes me that I don't want to forget.

I like to think of all the things I'm thankful for: Special things that happened today, my family, new things I discovered that I really like... stuff like that. I think that ritual just sort of helps me organize myself and calm down so I can sleep.

Sometimes if my mind is really cluttered I can picture my mind as a room and me organizing the thoughts into shelves and boxes inside it. For example, I picture songs as peices of colored string. If I get a song stuck in my head I can easily pick it up and place it in the drawer where songs go, then shut the drawer. This actually works! I have places for everything. Songs go in a little cheap plastic drawer, like the ones people take to camp. Organizing my mind honestly helps me relax and collect myself.

There's also this breathing technique my dad showed me: Breathe in for six seconds, hold for seven, breathe out for three. Drinking chamomile tea also makes me calm down, surprisingly quickly.

Hope this helps, and I hope I actually made some sense!