No wonder I can't gain weight

I know that with IBS not digesting everything is par for the course. I already have problems digesting dyes( which makes things interesting), things like lettuce, corn, carrots and other random bits and bobs when the ole' guts are working in overtime. But recently and at random moments in the past I can't digest fat. I mean at first I thought it was mucous. And I'm sure most of us have hit that several times with our our guts. But after stinking myself out of the bathroom this morning I figured it can't be good for my weight gain routine. It's not a constant thing but dang it that fat has better places to be then where it's ending up.

And according to my doctor I'm having no problems absorbing any nutrients, so I figure my guts are absorbing enough just not all at times.

It happens so little that I haven't really given any thought to what I have eaten to make it happen. But it does seem to happen when I have massive amounts of fat like my body can only handle so much. Yesterday I ate nothing but salami sandwiches( not sure why but eating is eating) and that seems to have a high fat content. I can't handle olive oil or nuts. Both set me off rather violently. If I bake with oils I seem to be fine but cooking any other way with them is disaster. I haven't had olive oil in well over two years and only have nuts rarely. Nuts back me up. I very rarely have any dairy because my tummy is so sensitive to dairy that ice cream, yogurt, and almost all cheeses give me noxious gas. The only cheese's that I can have with minimal problems is cheddar, provolone and canned sprinkle cheese.

Well, I'm also the person that can eat scrambled eggs with stuff cooked into them (like onions, ham and cheese), but can't eat those same ingredients in an omlette.

Beats the heck out of me. The only thing I notice is that the scrambled eggs are all loose and fluffy, whereas my husband has a tedency to cook the omlette so that it gets kind of crunchy on the outside. Not burnt, just crusty. I wonder if that changes the chemical composition of the eggs? They say that charring meat on the grill very much changes its chemical composition. I just know my husband's omlettes will give me D usually before I've finished it and scrambled eggs with ingredients don't give me D (although they can give me a bit of gas/upset stomach; that's why I don't eat eggs very often). Haven't tried other people's omlettes (for obvious reasons; who wants to risk it in a restaurant???)

But that's the same thing with milk, isn't it? Ice cream has loads more fat in it than milk. I tend to eat 2% or whole yogurt. Cheese fat varies. So why not milk? Why does it give me gas--even with just 1 cup--when more than a cup of ice cream or any other dairy doesn't phase me? All that stuff starts out as milk! The only difference is milk is a liquid and everything else is a solid.