Alright so I was taking pictures with my camera like I normally do and then suddenly the viewfinder in my camera goes a bit darker.
This is a DSLR so I don’t even know how this happens. When trying to take another picture the autofocus ring just makes a full turn in one direction and then a full turn in the other direction.
This keeps happening when I press the shutter button. I then put the lens in manual focus and the picture is completely over exposed.
I take pictures in 1/100 s and normally the exposure would be set correctly but now it seemed like the camera overexposed the image by two full stops.
I also have the focus point selection set to Auto and it used to light up the squares that the auto focus would focus on but now none of the squares light up when I press the shutter button.
When I manually select the focus point the square I select lights up, but the focus ring still only does one full turn.

What could be the issue here and how do I fix it? It is a canon eos 50 and an old sigma 18-200 lens.
Sorry for shit formatting as I am on mobile posting from where the incident happend. Thanks for any help.

Also wtf happend to 4chan? How bad has the bot issue gotten?? I have to wait 900s to get the captcha?? Like wtf I have to wait 15 minutes to make a post what is this bullshit