It is possible that you have MS, but you will probably not receive an MS diagnosis until your doctor has checked every other possible explanation. MS is diagnosed partially based on lesions, symptoms, etc, and partly based on the ruling out of all other possibilities. It is also possible that your TIA was related to MS. I was incorrectly diagnosed as TIA before I knew I had MS, and I know someone with MS who actually has had a stroke.
MS affects everyone differently, and because of its nature, it can be responsible for countless numbers of symptoms. The diagnosis process can be a long one, so you may have to hang in there a while yet. My biggest advice for you is to be your own advocate. It has been my experience that doctors do not share every detail of a patients test results with them, and some things that seem minor when taken by themselves are often dismissed. I suggest that you get copies of test results and doctor reports...it is up to you to keep track of the whole picture. If you have questions, ask someone who can help you. And try not to get discouraged. Hopefully you will find that you do not have MS, but either way, you are not alone. There are many people here who can relate to everything you are going through.
Be joyful in hope, patient in affliction, faithful in prayer (Romans 12:12).