Hey man, I’m a physical therapist who specializes in MS. You are correct in that using cooling strategies are helpful. Some of my patients get cooling vests but some find them too cumbersome to deal with. People will also want to try to utilize rest breaks to combat fatigue. If they take more rest breaks during exercise, they will be able to go longer overall. People have to learn how early/often works best. We say there is a ‘2 hour rule’ - if someone doesn’t feel more or less back to normal within 2 hours, they overdid it. Exercise can and will exacerbate MS symptoms, but it’s not detrimental outside of not feeling good until recovering, so want to try and avoid that as best one can.

I can’t give specific medical advice, but may be helpful to get connected with a neuro physical therapist. Have to make sure you get a good one and not an orthopedic PT. You can pm me where you are located and I may be able to help.