I suffer from nausea everytime i eat. i do have ms but never experienced this before?

?not related: Gstrointestinal symptoms are not related to ms (?Medications?) check with your primary doctor.

Co-morbidity: Although this could be an adverse effect from medication, such as Tecfidera, could also be a new superimposed condition of the stomach or esophagus, and you do need to have your doctor investigate this. Not directly a consequence of MS.