Aaaaaaah .... Someone else with IBS & Lactose Intolerance (why I commented on the lactase milk before). I understand the pain.
If you have IBS the amount of fat in your diet will also cause problems (although it does seem to be better than other things with me). I am not saying eat real clean, because for me at least a clean diet is too high in insoluble fiber.
What has worked for me recently (almost like a miracle, and I know about living in a bathroom) is the recommended soluble fiber :
5g of Metamucil and 5 g of Glutamine (for those who like call supplements names this is for gut repair not muscle growth) first thing in the morning and the same last thing at night.
Also since you are not too worried about leanness you should start off each meal with a white carb (bread, rice, potatoe, pretzels, etc) (don't bash this either) . Likewise, if you have IBS and not just lactose intolerance a lactase pill will help sometimes and sometimes they won't. Better to stay away from lactose. A solution to this is lactose free protein powders or Optimum Nutritions Whey now has about the same amount to Lactase in it as Lactaid milk.
And most important. Never ever take anything like a protein powder on an empty stomach. Ditto that for anything else you recognize as troublesome.
On portion size, eating more times a day will allow your body to digest. You get sick because your body, which already has trouble digesting, has more food than it could possibility digest at once. 6-8 meals minimum, 30-50 grams of protein per meal should be real easy.
Not trying to change you and make you eat clean, just differently.
Damn I killed your journal . Sorry. No more comments