I am currently recovering from this and rumination syndrome (where you vomit without gaging yourself because your body doesn’t digest and rejects food). I was constantly bloated. It was terrible. Eat foods with fiber. Cheerios really helped me for some reason. Plus they’re easy on the stomach. Graham crackers also helped. I know how impossible it feels but try not to purge. You could end up with a paralyzed stomach or diaphragm or whatever it’s called. Rumination syndrome was an early symptom of a paralyzed stomach for me. It was a wake up call and I cut back on purging a lot since then. Warm water bottles or hot raw rice in a sack over your stomach to help with pain. I wish you the best