I would say you are heading in the right direction. Please be aware that the MS diagnostic process can seem like it move like molasses in January, but if the MS Center is following the Revised McDonald Criteria, you will arrive at answers.
Stay strong! You might need to adjust your work environment, especially if you get a diagnosis. Much of the decision is up to you. If you operate any equipment or you could endanger yourself, co-workers, or customers, then I would suggest you seeing your EEO representative about reasonable accommodations in your workplace. If you decide to apply for disability, you should do so after making sure all of the requisite tests are in hand and your condition cannot be reasonably accommodated.
Again, we are here for you. There are many of us who have been with MS for a few years to decades. We are happy to share that which we have learned.