Oh, and I totally forgot to mention what you can do to lower your level of anxiety. Find a girlfriend and have lots of sex.
It is true that this will lower the anxiety, but it also has it's downside...No anxiety may lead into less focus on work and more focus on enjoying life on the short term. One might actually end up losing motivation for the studies when one realizes that one can enjoy life so much without whatever one was trying to achieve

The other problem is that it's not so easy to find a girlfriend who will settle for being an anxiety reliever only. There will be demands and after a while the relationship may become a source of anxiety. This can of course be avoided by making sure you end it is good time, but this is not always easy if one is not a very strong charachter.
If anxiety is caused by your mind trying to assess the things you were exposed to during the day and those things where the things you were supposed to work with, anxiety is often an inevitable part of the study process. If you want to avoid it you either have to give up aiming so high or learn to cope with the anxiety you get from the demands you are exposed to (often created by yourself). If you want to survive such an uncertain career as a musician, you just need to learn to cope with anxiety.
You can lower the anxiety by physical labour. If that is too difficult to arrange, it can be replaced by proper exercise (and I don't mean piano exercises here). Maybe you could even try an outing with your board in the evenings, have you done enough of that lately?
Young people also have general anxiety caused by the big changes in their lives and the insecurity of the future. Some more and some less. If one is completely anxiety free at that age, one may not be quite normal

EDIT:
One more thing: Do not use a lot of energy drinks or caffeine. Not even during the day. It may affect your sleep and your ability to relax your mind much more and much longer than you would imagine. After I gave up coffee, I have been able to get to sleep anytime I want to. And I am less tired in the mornings, so no need for the coffee.