So I'm late 20s, and 6 weeks ago had abdominal pain develop. It's largely lower abdomen pain but sometimes higher. I felt very gassy (upper and lower) and had variable bowed habits. No blood in stool, no nausea or vomiting.
My anxiety went through the roof and I stopped eating which led to weight loss for the first week or so, but that has stabled (or even reversed since)
The pain has come and gone since then (have had 3 'flares' of pain lasting 2-7 days each).
Have had normal bloods (including ca125h), urine, stool culture negative, QFit negative, USS scans, CT abdo pelvis and flexi sig. calprotectin 180 which I gather is probably normal but possibly some inflammation.
Have appointment for colonoscopy soon.
I'm starting to think it's going to be IBS. (As have weeks of complete normalness between 'attacks')
My query is- has anyone here had sudden onset start of IBS like this? I was in hospital being assessed by surgeons for appendicitis or obstruction when it first started and it really came from nowhere.
Any personal experience welcome. (Please don't tell me to see a doctor as already have and investigations ongoing 
)