Advice needed

I was diagnosed with moderate gp after my 4 hour emptying study showed I had 30% after 4 hours. I just want some general advice and tips to help manage this condition. I do see a gastroenterologist but he has not messaged me about my results or anything yet. It doesn’t matter what I eat my stomach always hurts and I feel nauseous a few hours after (usually 1-2 hours after I eat I start to feel nauseous). I have hEDS and was suspected to have gp for a while before diagnosis.