While I must agree that your doctor is not an MS Specialist, I must congratulate you on being blessed with a doctor who is moving you along. Sometime we have to take our blessings where we can find them. Some symptoms of MS which may seem like muscle problems in the back can actually be cardio problems in women. I think it is good to get some of these tests out of the way and hopefully you will be able to get answers.
If you can, please have copies of your tests sent to an MS Specialist for follow-up.
Again, I am happy you are feeling happy!