You and your doctor have a very full plate! Try not to worry as to whether it is MS or not. Many things can mimic MS. However; I know how you are feeling.... not knowing what is going on. Not knowing is worse that actually getting a diagnosis....even if its something you don't want to hear. So we worry and worry causes anxiety and things just get worse!
My MS did bizzare things for 12 years before I had a positive MRI and a definate diagnosis. But it can come quickly.....11 years of tests and MRI's that were negative. Then a repeat MRI in the 12th year was negative and 6 months later it was positive.
Your symptoms sound like things that happen with MS, but you've also had other things going on.
Please hang in there and take care of yourself....keep going to the doc and please keep us posted.