My sister is 28 years old and has extreme pain in her stomach sometimes after passing urine or stool and in severe heat temperatures.we checked with gynaec, gastreo specialists, various scans and endoscopies,urine,stool,blood tests have been done in past three years, with no avail.doctors have not found anything wrong in any of reports.please advise if there is any other treatment or doctor specialised in these kind of ailments treatment that we can seek advise and treatment from.