@gaboslastresort Welcome to MayoClinic Connect. I’m sure some members will see your discussion and stop and give you some help and tips. I honestly don’t know what’s wrong and we can’t diagnose on MCC because we’re not medical professionals. I would suggest that you find a comprehensive medical center or a university teaching hospital near you. The doctors are usually a step above the community doctors. Just call. The operators will know where to send you. Don’t be surprised if there is a wait to be seen. That’s just the way it is. While you wait for an appointment, you can summarize your discussion for use with the doctor. You want just the main points that relate to the problem of not being able to use your legs. You might also want o follow this discussion group: Bones, Muscles and Joints: https://connect.mayoclinic.org/group/arthritis-and-joint-conditions-268850/ And you want to continue PT and do your exercises at home.
What, of all your symptoms, makes you think it’s an autoimmune disease?