Doydie,
A couple weeks ago I went for a walk on my lunch at work, it was a 20 minute walk across the highway over to a store to pick something up then back to work. That night I had the worst ever leg spasms when resting and they woke me up all night. Then the MS symptoms started to flare up each day.
I used to be able to take a 30 minute walk almost every day. One thing that was always essential for me was starting out very slow and building up speed gradually, then stretching afterward. Each stretch should be held for 45 seconds to get the full benefit, according to my past MS neurologist. So maybe if you do this it will decrease the ill effects for your next workout.
I am very proud of you for losing weight and getting in shape. You're an inspiration to me.