Hiya, I think this is a good question and I am hoping that the results of my MRI will give me the answer to my sudden change in bite. I actually think my bite change is due to the disc (my left disc) because that's where I always had a click, but at the start of this year the click suddenly changed to a thud on closing my mouth, changing my bite and making it even more difficult to yawn because my mouth opening also was suddenly reduced. So for me I am expecting to be told the disc moved out of place and for me that would explain my sudden off bite.
I hope that you are able to find and afford treatment off a specialist, I know it can be costly, I'm starting treatment in the next couple of months
All the best.