Is Stomachache A Symptom Of Shingles?

my husband has had shingles for approx 8 weeks, the rash has gone but he is still getting the shingles pain in his back and side, he also has been experiencing pain in the stomach, he is taking omoprozole for years and the doctor has increased the dose to twice a day but it is not working, is this stomach pain related to the shingles?