PF, I just read in a MS magazine, that came in today's mail a good explanation to your question.

The MSQR from CMCS and NARCOMS magazine. It was trying to explain the criteria for getting disability. I was surprised to see that under the whole listing of Fatigue issues, it said, "Fatigue that causes breathlessness" this is one of the criteria for getting MS disability, among other symptoms of course.

So do you think with the hot weather, dust bowl dryness, working hard with the animals and horses..and getting fatigued, could be your problem?