Hi dr , my father age 67 ,he feels.like puking /vomitting whenever he ate something or even while putting thermometer in his mouth he is having less food than before due to this . he got his second dose of covid vaccine on 28 april 2021 after that he got fever which persist below 99.5 he is currently on five days medicine course of ivermectin, azothromycin and paracetamol with vitamin c and zinc.. plz suggest what we can do for his felling like vomitting and puking.