Thank you Starznight and others for the info. I was always under the impression (apparently incorrectly) that MS symptoms were rarely on both sides at the same time. Like maybe a weak leg one day and the other leg would act up the next time? My symptoms are almost always identical and symmetrical. I get feelings of weakness in both arms or both legs that come and go. I love to jog and couldn't go more than 1/4 mile last week. It was like I couldn't propel myself forward any faster no matter what I did, so I walked. They felt strange - like they were someone else's legs! Then the next day I was able to jog 3 miles without a problem. I am truly at a loss.
Thanks for the info. I am currently being worked up for MG, but the symptoms don't quite fit.