As far as the symptoms of relapsing remitting MS are concerned, they include some like eye pain
and so on. Yes, ayurvedic breathing exercise
like pranayama and yoga will increase the defence mechanism in the body and oxygen supply which can help in MS.But as far as your swllowing or lung issue concerned, you need to consult a physician for further check up and very rarely it is related with MS.
Take care and have a great Day.