Do it Pastis.
I've suffered from stomach/bowel problems since the late 80's and prolly had every test going, some of them straightforward and some uncomfortable and slightly undignified. At one point I was told that I must have held the record for the fastest time for a barium meal to go through me, it's normally around 45 mins to get through befor they start x-raying, I did it in 13 minutes, so not so much a digestive transit, more a Mercedes Sprinter
At two points they suspected bowel cancer, but on both occasions they disproved this. Better safe, than sorry
End result for me.... chronic IBS