Experiencing view spazzing in gmod

I’m not sure if this is because of a recent update or not, as I haven’t played gmod since last summer break, but today I opened gmod and experienced a very unique glitch. My gmod main menu normally displays a map rather than a vtf, but upon opening gmod, the background was spazzing out, with the camera angles jerking violently in random directions. I assumed this might’ve been due to an error in the background alone, so I started up the Elevator Source mod, and noticed that the view in-game was doing the same thing as well. I tried a couple of console commands like cl_drawhud 0 and thirdperson, but nothing could change the extreme spazzing of the view. Any ideas or suggestions? Is this happening to anyone else or just me?