I meant to say something before leaving again, but these times I need some time to myself kind of happen suddenly and strongly, to the point I just have to go all together right away. Usually I get too nervous to return after that happens, but that's a different problem. I'll be here for longer this time, I hope.
Anyway, thanks for the advice! A few things have happened. I asked my doctor about the medication, and he thought it was a good idea. Actually, it seemed like he was planning to suggest it himself. So, yeah, I've mostly stopped taking it and I'm starting to feel better. Not too much better, but better nonetheless. I still feel that I'm not ready for uni though. Haven't gone to the help center yet, though I know I really should have... but I haven't had the energy to do much of anything. I'll try to do that now that I at least have a bit.
I have tried tutors before, and they help a bit, but not much. There was a thing I had in grade 10 that really helped though. I dropped one class to make time for it, and then whenever I would have had that class, I instead went to a support teacher who would help me get past my mental blocks and actually get things done. They also could act as a tutor if necessary. Basically, it gave me a scheduled time almost everyday where I could go somewhere where I could work on anything I needed to do in any subject and there would be someone there to help be past my mental blocks (which have nothing to do with not understanding the actual course material), and then go and have much less to worry about, which also meant less stress overall. I guess that sounds kinda childish, pretty much needing a supervisor to actually get things done, but it's the only thing that ever really worked for me. But, though I haven't checked, I doubt the university offers such a demanding, even infantil, support, but maybe.