Even if everything you are doing seems to be too much, keep doing at least some of it. As lots of people have said, exercise - if nothing else, it will make you tired enough to sleep properly.

Probably you should go back on the medication, no matter how little you like it (chocolate might count as medication, but a balanced diet around it is necessary, too)!

Last but not least - you've learned to play more instruments. I've never learned to play any, so you are doing better tham some!