It sounds like the colon surgery may have left you with motility issues which may be causing gas. Food sensitivities can develop after stomach surgery too so you might need to try the FODMAP diet.

In the meantime ginger capsules may help, you can take them with your meal or immediately after. They really help my digestion, especially when I feel like the food I ate is just sitting there.

While you are healing avoid all alcohol. Chocolate and caffeine can also make the esophageal sphincter tender, it may not cause soreness immediately after you consume it, but turn up the next day. Try to get off of the PPI's as the long term side effects are not good. I think they were originally meant to only be used for 8wks max.