Mine starts as soon as I start eating - sometimes I do not think there is a relationship between food but sometimes I do????. I am really careful what I eat and have tried to cut out as much , dairy, sugar and wheat as possible. I have not had a stool sample or a colonoscopy - but a whole load of other tests, think the doctor is fed up with me now, I asked him to do some tests on bowel but he said there was no need.
The pain has subsided a lot and I am able to do more but it was a horrendous 12 weeks and wish I knew what it was for sure, I feel it is the not knowing and still having the pain even if it is not as bad at present...the fear of it getting as bad a gain!
I wish you well with your tests and if they have found fat in your stool they are bound to check it out more.