Well, my toes had a mind of their own since, um, I can't really remember, but all of this century.It might have been something that happened gradually. I had my first MS trouble when I was 24, but it was all so mild back then, I just ignored it for the most part. I had my plantar reflex tested first by my neurologist in 2003. David has done it since, but I managed to keep it hidden from him before that, just cutting my toenails when safly locked away in a bathroom. My GP has never tested it, or an orthopaedic surgeon I saw in 2000, who wrongly diagnosed me with congenital spinal stenosis. Now my left leg either curls up but hardly at all, or curls down or hardly does anything. My right foot is more violent, but not nearly as much as before. I get David by and large to test it, because it is easier for someone else to do, but I know that I can cut my toenails on both feet without injury.
I think you will really impress your GP if this carries on, because as far as I know, the conventional theory is that once you have it you are stuck with it.
By the way, you got me worried when I started to read your first sentence about gasping for oxygen!