NOT A DOCTOR. THE FOLLOWING IS IMHO AND IS NOT MEDICAL ADVICE.
I dove with a gentleman who has MS three weeks ago. MS is one of the condition Handicapped SCUBA Association (HSASCUBA.com) certifies for diving and trains dive buddies to dive with (such as myself). You need to sit down and talk with your doctor and have him/her confer with Divers Alert Network (DAN) if he is unfamiliar with the requirements of diving. With MS, heat will often set off an attack, so you want to avoid getting hot. That means you need to get suited up and into the water quickly to avoid overheating. Fatigue is also another factor, so your dive buddy may need to provide more assistance. Your dive buddy of course should be informed as this affects them as well. My father-in-law had MS.
By now you have probably discussed the course MS will take or read about it on line. MS is an interesting illness and can take many paths. Each person is different, but you may be able to continue diving for many years even if you use a wheelchair.
You of course should take precaution, such as calculating your dives as conservative and when using your dive tables add 3 meters to your actual depth for all calculations to add an additional margin of safety. The challenge is of course that MS and DCI share the same symptoms, so it will be more difficult to tell after a dive if you had DCI or if you MS is kicking up. This of course is not a good thing if you dismiss a DCI hit as just you MS the consequences could be, well, not a good thing.
People with MS can get certified to dive through HSA. Divers who experience a life changing event such as an accident or illness like MS are encouraged to re-certify in their new bodies to learn about techniques to use (how a paralyzed individual exits the water etc) and to demonstrate that they can still preform all the necessary skills. There are several HSA instructors in South Africa. Visit
Handicap Scuba Association and use find a member to locate them. You can also use the website to locate trained dive buddies or to find training to have your friends trained as dive buddies. Dive Buddy training will educate them on how to better assist you in your diving.
AGAIN NOT A DOCTOR, just a HSA dive buddy, The above is only IMHO.