Consistent problem with camera

So I've been having this problem for months and months caused by one of the big updates I believe (?) Not completely sure but whenever I load into a game even with no cc and a refreshed folder and everything, moving the camera works for about 5 seconds. The minute i press shift, it completely breaks and I cant even use WSAD and my right click spins my game camera out of control. Does anyone know a fix for this? I swapped mouses and closed every application/background application as well and everything. Please send help 😢