I'm sorry you're feeling so down. I agree with your T that you're very strong and determined to find resources to help improve the quality of your life! Those traits WILL get you far!
I'm glad your parents will pay for the music therapy. It's hard when you compare a new T to an old one who you liked so much. That's how I felt when I met with the DBT T. Learning to play the piano sounds like a great idea! I used to take piano lessons when I was young.
Did you tell your T that you're sleeping and missing meals? That's not good for your health but I'm sure you know that. Maybe they can get you in to see the pdoc sooner. Maybe you need antidepressants?
I'm rooting for you and I know things will work out. It just takes time and trial and error. Hugs and more hugs for you, adel.