my wife has ms rr for the last4 yrs, currently using copaxone daily + an assortment of pain relievers- oxycodone, morphine, tizandine, naproxen, etc. , all of a sudden she relapsed to the extent of severe headache, sciatic pain,vision impairment etc. had to take her to er for relief - said it may be sinus infection - test results proved neg. - Is this common with relapse of ms?