I had covid in March. I wouldn’t say that my medicine “stopped working” (at least not more than usual) but rather that it wasn’t able to overcome the brain fog and fatigue I experienced for several months afterwards. I barely got anything done, spent a lot of time in bed, felt like a zombie. I was worried I had chronic fatigue or something like that, but as of this month, I’m starting to feel better again and I’m getting a lot more school work done.
You aren’t alone. I’ve had an extremely difficult time keeping up in school. I’m normally a very dedicated and hard working student. Before I got sick, I would study about 30 hours a week. Now, I’m lucky if I can do more than 5 hours of school work. You might have some post-covid brain fog and I’m so sorry if that’s what is happening. I haven’t felt like myself most of this year and it was scary and depressing. I don’t feel 100% yet, but I genuinely feel like the fog is clearing now. I hope it starts to for you as well.