Isolde,

I studied double degree physics and music for 3 years, at which point I went to the hospital for bipolar disorder. For me, the stress was to blame. I ended up choosing music and dropping the physics degree.

Choose what path is right for you, but clearly the two degrees is not working for you. You have to pick one. Message me if you want to, I can tell you all about my experience.

I will say this, I did practice until 1am many days, and that didn't help. I had to find a way to create balance. It is possible.

Music may not be the cause of your distress. My money is on stress.