It seems I fixed my issue somehow. I had my friend host a server instead for multiplayer, and everything has been working perfectly fine. I have no clue why this worked, but I'll take it.

Perhaps. Is there a software I can run to check?

Game was working perfectly fine a few days ago, restarted my computer and now I can't even play the game at all. My drivers are up to date, and I have restarted my pc multiple times. Every now and then I can at least open my save and walk around for about 15 seconds, but it inevitably crashes anyway...