IBS flare ups: weight gains

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I went from a continuous 115lbs to a 120 in a couple days. Didn't increase calories. Just may not be eating healthy calories. I went to bed feeling super full and crampy, and haven't gotten normal since.

I have IBS unfortunately. I can go months and months with no problem and BAM here comes hell.
My abdominal area is bloated and swollen, and isn't squishy at the touch.

Anybody else deal with IBS?
How do you not get on yourself when a flare up occurs? I can't even wear tight shirts. I look pregnant after any food consumes.

Feeling really negative about it. I get confused with fat gain and IBS flare up gains.
It really does get upsetting.
Just want this five pounds gone!