Are you still in pain or is it only the GI issue? I tend to have digestion issues when it's hot and I am not acclimated (and, oddly enough, also at the beginning of my menses). If you are not in pain, it could be something transitory, including some virus. I would give it a couple of days, give your system a rest (broth and steamed rice or rice porridge), and if the symptoms have not cleared, visit the doctor.