Camera tilting/jaggity camera glitch

Hello, every time I enter build mode, and I try to tilt my camera it doesn't allow me to, I've tried all the fixes like removing my mods, repairing the game, changing to different camera settings and even trying a new mouse even though a couple months ago I was playing the game just fine with my current mouse. I am also experiencing extreme choppy graphics, and there is nothing wrong with my graphics card as I play pretty graphics heavy games all the time and have no issues at all! Pls help me!!! :)