How to get up after a fall:
How to get back up after you have fallen
1. Stay calm.
2. Examine yourself for injuries—bruises, possible sprains, broken bones.
3. If you are confident you haven't broken any bones or experienced a serious injury, search for the nearest piece of sturdy furniture. (A chair would be ideal.)
4. Roll onto your hands and knees, then crawl or drag yourself over to the piece of furniture.
5. Get into a kneeling position and place your arms on a stable area of the piece of furniture (e.g. the seat of the chair).
6. Bring one knee forward and place your foot on the floor.
7. Using your arms and leg simultaneously, push yourself up and pivot your bottom around until you're sitting on the piece of furniture.
8. Stay sitting until you're confident you can move around without hurting yourself or falling again.
9. If you find that you are unable to get up after falling, stay calm and try to alert someone to your predicament. While you're waiting for help, endeavor to keep warm and move around slowly to avoid placing too much sustained pressure on any one area of your body.
10. Notify your doctor that you've had a fall.
(From AgingCare.com)
On the list, #10 seems optional to me. I see no need to notify the doctor after every fall if you have MS. You should mention how many times you've fallen in the past year to your doctor, however, and that means keeping a record of your falls for reference.
As for #9, alerting someone to your predicament if you can't get up can be a problem. If you have a cellphone handy, use it, or use any emergency personal response devices you may have available. Call loudly for help, but if your voice is too weak to be heard, knock on a wall if you have neighbors who will hear. Or wear a whistle around your neck (or keep it in your pocket) and blow on the whistle.