Get money despite being unable to work?

Hello! I did my MSA last year but then wanted to get the university of applied sciences entrance qualification, but my plan was canceled because I'm currently having psychosomatic problems. I was then put on a BvB measure but they told me that it just wasn't the right thing for me. I was supposed to go to a special clinic but that's not certain yet. The job center classified me as unfit for work and I didn't have to go on the BvB anymore. I was accepted into a university of applied sciences for August. The psychosomatic problems came about because of Hashimoto's (underactive thyroid) and the subsequent weight gain. So the goal is to lose weight (20kg) to reduce these problems. The problem now is that my mother doesn't earn that much. I always got €300 in the BvB, which I paid for my special diet, which is also for my type 1 diabetes. Now I don't know how I can earn money since I can't have a part-time job because of the pain and psychological problems… I'm asking for help, thank you!