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Vesicles on the back of your throat can be due to many possible reasons, one being Coxsackie infection
which is viral. Also it can be strep throat
which is bacterial. You will need to get a proper confirmation because treatment of both vary.It is rare that any of these medication can cause such a presentation. AST, ALT need to be 3 fold higher than the upper limit to be significant. Do get evaluated for possible pancreatitis
which can be associated with Coxsackie viral infection if you do get upper abdominal pain
. Sphincter of Oddi dynfunction can be treated by Endoscopic methods quite reasonably. Do consult your Doctor in this regard. Avoid fatty, oily food. Eat plenty of fresh fruits and green leafy vegetables. Drink plenty of water. Exercise regularly.