Dmds, extavia and side effects

What are everyone’s side effects from extavia. I seem to have burning muscles lots like I’ve done lots of excercise, I seem more tired between 4 and 7 the passes and I keep having more palpations. I have had some before and take 40g beta blocker morning and night but not covering it now. And overall stiffness is worse fingers legs feet. Also my neuro said I’ve had 2 nasty relapses. And other smaller ones. I’m beginning to wonder If extavia is the appropriate treatment.