i wrote a response to a similar question back in 2018, which is probably why your question was ringing bells but i wasnt coming up with what i thought i would....basically im still not sure if you have been diagnosed with primary progressive thats not active or if its relapsing remitting that's not active ie not progressing or if there is a super rare subset that isnt well known ???
I would highly recommend you contact your area's local MS society because they definitely will be able to provide you with all the information that's available and they might be able to put you on to another neurologist that specializes in this type MS, at the very least they would be able to point you in the right direction.
Hopefully you get something useful out of this, sorry couldn't be more helpful though............JJ