Need advice over my studies.

I’m currently doing Msc Economics in Germany as an International student and this is my 4th semester. From past 3 semesters, I could only get 5 credit points.
Last semester was my breakdown, I studied throughly, did everything and answered every question properly yet i couldn’t get 30 credits that I aimed for.

Now i feel exhausted mentally and physically, my work place is extremely toxic, every now and then there is some issue with my workplace. My co-worker is extremely problematic and misogynistic who believes taliban is good and women shouldn’t work after 6. He even once verbally attacked me while he was having a conversation with the manager over some political conversation.

He apologised and cried but regardless I feel sick. I also feel sick seeing how my manager and the owner didn’t even take stand. This was 100% infuriating.
I want to change my workplace but at the moment I can’t due to visa restrictions.
Now i feel i’m mentally, physically and emotionally exhausted.
I feel I’m still where I was two years ago with zero progress.

Is there anyway to give me advice, I need to study and don’t wish to give up on degree but I feel its a waste of time since nothing is working regardless how much efforts I put and how hard I work.