Question: Effect of Long Term Term use of PPI's for Barret's

I have taken PPI's for Long Time lately on Dexilent and have current symptoms of Bloating, pain gas after eating and lately constipation. The constipation was relieved by use of Restorlax. it seems to me as the food touches stomach gas forms . No solution was recommended by the GI specialist. Are there any Probiotics tested to normalize this condition,
or how can one go about normalizing this condition.