study and mental health

I don't no what to do. I had a nervous break down in 2017. Its taken a long time, but i am seeing improvements and I'm happier. I quit my job of 12 years as it was some cause to my break down, and then took 2 years off from anything. This year I felt I was in a good enough space to study something iv wanted to do for a very long time. I wS smashing it out then corona hit, then other obstacles hit, and one big one is still happening and I'm having health issues like a cancer scare, and I am being assessed for n autoimmune desease, so I couldn't finish my course. now im on a continuance this semester to finish in December. Iv had 6 weeks of no tafe in that time i havent finished a signal assessment. I look at them n have panic attacks. I only have 5 assessments to do but they r big. I want to defer until next year, but worried I may not get approval from my new case worker at my job network. I'm worried ill have to pay course fees back. I'm falling into a deep depression again n I don't want to break again