I started having lower right pelvic pain about three weeks ago. My GP checked for a UTI (negative) and also, had me do a CT scan with contrast to check for other things, like kidney stones (negative). Well, I had a total hyst back in 2004 for severe endometriosis and I'm now taking HRT. The pain is so similar to my endo pain when I had it. So, is it possible for endo to return after the hyst?