Very well could be the case... but how long after taking the Iodine did you drink the beer? I put 2 and a half droppers (120mg) in an ounce of OJ in the morning on an empty stomach and it only felt weird in my stomach and throat the second day. I usually drink a 12 oz coffee on top of that and wait an hour to take my supplements with yogurt.
Is the pain higher up in your stomach, like right under your sternum... or is it lower, in like your belly button area?
I think trapper might be right with a fast. I did one with oj/apple juice/water/chicken broth for 5 days and it took away the gas pains i'd always get that started a year and a half ago when i had my gallbladder removed. As long as I keep my dairy, Sugar and meat intake minimal, my stomach stays calm and doesn't bloat.
When you eat, do you have to run to the bathroom right away? What are you eating?
A lot of questions.. but it does matter. Something in there is upset.
You might get some relief from marshmallow root tea... it sort of coats your stomach. Umm.. cabbage is good too. I wonder if Rejuvelac might help too.
Ginger is another good one and you can blend it in a smootie.