I'm really starting to think there is something wrong with me. My left leg feels very heavy and I keep imagining it giving out. I can't tell if its actual weakness or if I am just imagining the swaying. I can still do sprints but I tried running and it was tiring my leg out. I don't think it's ALS now but I think it's MS as I am so focused on it. I have self tested it multiple times, but could I have just completely exhausted my left leg? I have hopped on one foot up and down my stairs multiple times this morning and can balance on one foot on my toes and walk on my heels and jump on one foot onto a table that is about 3.5 feet high. Can someone with MS do this or is it just the start of the disease?