Asking Allah for strength when illness feels overwhelming

Assalamu alaykum. I’ve had a chronic illness for years and most of my du’as have been to ask Allah to heal me. Right now I’m at a really low point - I barely have the energy to get out of bed except to make wudu, and sometimes even breathing feels exhausting. I end up spending my days lying down and I’m often too drained to use my phone. What I really want is energy to study, to look after myself, to give back to others, and to meet new people and make friends. Instead I feel like a burden because I can’t care for myself. Sometimes I find myself making du’a to die if I’ll never get better, because I want the strength to do good in this life and learn things, and it’s hard to see the point of being alive if I can’t physically do more good deeds. But I’m also afraid of death - worried about the punishment of the grave and whether I’d be dying with sins. I don’t know. There are so many subjects I wanted to study since I was a little girl, and I’m stuck in pain every day. I’m supposed to be at university studying computer science, but my health keeps getting worse and I haven’t been able to study at all this year. I just wish there was more to my life than this suffering. Please make du’a for me and any advice or gentle words would mean a lot.