Soapy taste in mouth

Hi all! Diagnosed nearly 2 years and been off Rebif since Dec as starting gilenya on Thursday. Last week I had pain behind eye (have had ON in the past) which usually signals flare up for me. Sure enough on Wed had burning on R hand side of torso which is new, more tired than normal, more pain than normal. Today I ate a chicken sandwich and presumed I hadn’t rinsed the plate as it tasted of soap. Sliced an apple and same thing. Couldn’t eat my tea…as everything tasted like soap/bitter. I have even just tried chocolate which to my dismay is the same.