Why does diabetic stomach bloats?

I had gestational diabetes and controlled it with diet and exercise. After 3 1/2 year I was diagnosed as having diabetes type II and was put on the pill. I do not think the pill is working and discussed this with my doctore. Last January my stomach started bloating, I suffer with reflux and have irritable bowel syndrome (IBS) . I am trying to understand how does diabetics food digest. Is there a diagram of this process?