[b]EDIT: [/b] The issue seems to have fixed itself after a windows update, thank you those who tried to help. I got a new mouse and I tried to put the game at 105 fov earlier today and it instantly put my fps to 15-20, I tried reverting and putting my settings at the lowest level possible but nothing worked; here's some of my specs: GTX 1060 6 GB VRAM i7-7700HQ @ 2.80 GHz 16 GB RAM
FoV is one of the biggest impacts to performance. I'm not sure why yours wont revert back though. I don't mean to sound like a smart ass, but did you save your setting when you changed them back?