What Causes Dizziness And Vomiting After Taking Amoxicillin And Acyclovir For Cold Sore?

Hi there,So I wasn't feeling good for about a month and decided to go to a doctor. He said it was probably a sinus infection the way I told him my symptoms . I also has a cold sore when I was getting sick . He gave me amoxicillin and acyclovir and been taking it for four days now . Yesterday I been very dizzy and vomited . It it's from the acyclovir . What should I do p