Experiencing intense cramping & diahrrea despite low-fat/sugar diet. What's up?

I'm 19 days out from my lap RNY gastric bypass. I've been tolerating foods with no problems (in fact, things have seemed a little too easy), and I'm now beginning to transition from an all-puree diet to a soft foods diet. Twice in the last week, I've been waylaid by intense cramping, gas and diahrrea. The first bout began on Tuesday with some nausea and pain on drinking. By 3 p.m. Wednesday, I was in agony, spending my time lying in bed in pain or in the bathroom. The intense pain - spasms every couple of minutes - and occasional chills lasted for about nine hours before subsiding. Afterward, on Thursday, my stomach/intestines were pretty "talkative" and clearly unhappy with me. Today, the cycle is beginning again, dashing my theory that the first experience was some kind of vicious stomach virus. Of course, I'd be sure this was dumping - albeit, an extremely long bout of dumping - if I'd eaten excessive fat or sugar before experiencing the problems. But I haven't. For instance, this is what I ate yesterday: * Two meatballs and a tablespoon low-sugar tomato sauce * 1/4 cup no-sugar-added chocolate ice cream, with a little protein powder topping * 1/2 can fat-free refried beans w/ @10 pieces of shredded cheddar and 1 teaspoon of low-fat sour cream * 2 tuna cakes made of 1/2 can of tuna (can made four cakes, all were cooked in 1 tablespoon of olive oil) I've tolerated all of these foods no-problem since the surgery. Moreover, I hadn't had any of these foods the day before my last experience with these problems, earlier in the week. (The last time my diet the day before was generally a scrambled egg, some ham salad and chicken salad as well as 8 ounces of milk). At any rate, can anyone shed some light on this problem? I obviously can't keep dealing with this twice a week (my job wouldn't look too kindly on two sick days every five days, for one)! :) I'm getting concerned about determining what's causing this - so I can avoid it completely. Thank you, Jen.

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