I am a diabetic and have also been on Reglan for 6 weeks for gastroparesis. Back pain was there prior to G.I. problems, but has become much worse in the past two weeks. Due to G.I. problems, have lost 25 pounds in the 6 weeks. Eating has improved, but back pain has worsened. All of the G.I. symptoms appeared after I started taking Valtrex in February for an outbreak and I don't want to start the whole awful cycle over again.