This is a difficult situation - sorry you are going through this.
Unfortunately, You are the only one that can help you pet. Your pet needs to be seen by a qualified Vet. You must have some friends or acquaintances that also have a vet - get their recommendations.
Nobody on the Internet can ethically diagnose a pet or a human in this way but it sounds serious. The pet needs to be seen by a doctor. Guessing like this will only make things worse. Please get to another vet.
Best of luck to you and your pet. Sending positive thoughts your way.
This thread will now be closed. Please feel free to open up a new thread after your pet has seen a vet.