My doctor’s surgery has a big poster up, saying who’s eligible, and on it is: “Chronic neurological conditions”.
If MS isn’t that, then what is? Why don’t they know their own criteria? I’d keep pestering, if I were you. You’re entitled to it, and should get it!
As for “lucky you’ve got MS!”, Pfffff! Of course doctors must see many things worse, including conditions that are rapidly fatal. Perhaps he’d just seen a very sad case that day? But that doesn’t make it OK to tell people with other serious conditions they should think themselves lucky! I sort of know what he means, but it would be much luckier NOT to have it, wouldn’t it?
Just in case you do end up resorting to the pharmacy, do you have your original diagnosis letter? I’ve always kept mine - hardly as a badge of honour, or for the happy memories, but just in case I ever need to prove it.