LIST EVERY SYMPTOM YOU HAVE EVER HAD because with MS, old symptoms can always come back, and listing ALL old symptoms is perfectly fine and legal. So think long and hard to try to remember all your past symptoms, especially documented symptoms even if such documentation is just a hand-written comment in your patient chart. Even include symptoms that you never mentioned to your doctors (we all seem to have some of these).
With every symptom you list, you MUST be very, very specific about the way(s) in which each symptom stops you from being able to work. Print teeny-tiny, use the back of the page if it's blank, attach another page, and/or even use the margins if you have to in order to fit in all your sentences, BUT PRINT NEATLY, the importance of which cannot be emphasized too much.
1. Severe, intractable burning neuropathic pain in my legs makes it impossible for me to concentrate on tasks at work, often causes me to scream out in real agony during the day which upsets my coworkers, and makes no one want to work with me which stops me from meeting my daily quota of deliveries.
2. My severe flatulence, in which I can have episodes that last up to 45 seconds or longer, is extremely loud and smelly, and no one wants to work with me; I also keep having to leave my desk and meetings to go to the restroom for extended periods of time due to fecal incontinence.
3. Uncontrolled, severe spasticity causes my fingers to contract into a fist which makes it impossible for me to hold a pen or pencil, and my typing speed is extremely slow with many errors.
4. My slurred, slow speech makes it too difficult for other people to understand me which prevents me from performing my job duties.
5. Chronic brainfog makes it extremely difficult for me to think, make routine job-related decisions, and understand basic customer problems, so I often make lots of costly mistakes in my job duties. I also cannot learn new concepts, and training sessions become frustrating for everyone.
If you'd like, tell me a couple of your symptoms, and I'll try to write answers for you. Keep in mind, though, that I am not a lawyer and not a professional in employment matters.