Not sure what to say. It really sounds like you've had a terrible time. You definitely need medical advice. I would definitely get a second opinion from another bariatric surgeon. It sounds like your surgeon may have missed something (or possible even had a complication with the surgery).
I have had neuro problems and unusual MRIs that were triggered by my surgery (I basically had an immune system break down). I have a neurologist who is monitoring it. Sometimes our bodies freak out after the trauma of surgery.
Unfortunately, I think you're going to be stuck doing a lot of medical tests until they can figure it out. I'm so sorry this is happening to you. Your surgery shouldn't be like this. Describe every symptom and advocate for yourself! I think you may have a couple of different problems there which is going to make a diagnosis difficult. Make the doctors listen to you. Don't give up hope! They will figure out what is wrong with you!