I never had hep A, but have considerable experience with nausea and vomiting, While on treatment for hep c these symptoms were almost continuous. Ondansetron 8mg ODT (orally disolving tablets) worked well and gaviscon, that I learned would stop my retching immediately. One morning I was standing at the counter trying to figure out how I was going to get down 20 grams of fat so I could take my pills and began to retch. I'm not sure why I even tried the gaviscon, which is an antacid, but it stopped the retching immediately. The good part about hep A is that it usually does go away. I wish you luck and will pray for you.
Thankyou very much for your suggestion I will try this asap.