Sounds like ms symptom and maybe it would be good idea to speak with your ms nurse or doctor? They need to know about all new symptoms and maybe you won’t be as scared if you understand what it is . I know all new stuff is scary so you’re doing the right thing posting on here, there’s lots of helpful and knowledgeable people !
Ps, I’ve had a similar experience a couple of times and it turned out to be anxiety and fatigue!