I have to agree with both Elfindoe and also with Joolsg and others. It's a pretty pathetic survey but there is a comments box towards the end where you can type about your health issue and there's a promise that all comments will be reviewed by a neurologist. I certainly made good use of it (!) and suggest all other forum members do the same. See Joolsg post for the link.
Many thanks to those regular contributors who keep us up to date with these things.