Syl, I hope you feel better. I would make an appointmet to talk to your doc about it rather than waiting. your doc may have some ideas of things to test for or some meds you could try for relief to help determine what's going on. I learned the hard way that toughing out these bouts of pain without treatment can cause permanent damage, for me to your colon by getting diverticulosis, so I should have gone in and got the meds, in my case IBS meds to stop the colons. There's also some bacteria and stuff they can test for. And at least if it comes back, you will have it documented ahead of time.
I hope you feel better and sorry you had so much pain.
--Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us. Bill Watterson (1958-) cartoonist "Calvin and Hobbes"
Ills--Sjogrens-Lupus-like AI Disease, Hashis, Vitiligo, spinal stenosis/fusion with plate, salivary/lymphectomies, Diabetes, NAFLD, COPD, RLS, neuropathy, trigonitis, hystero, diffuse brain atrophy, GI nightmare
Meds--Plaquenil, Evoxac, Metformin, Synthroid, HCTZ, Estradiol patch, Prosed, Detrol, Klonopin, Ultram, Vicodin, Restasis, Albuterol, steroid injections and pred prn