What Causes Stomach Discomfort And Frequent Urination?

Hi, I'm a bodybuilder and about 5 weeks ago started a cycle of a mild prohormone (a prohormone is a precursor of an anabolic steroid) called HDrol. I have had to come off the cycle after experiencing some lower back pain which I wasn't sure if it was a common side effect known as "back pumps" or if it was my kidneys or if it was just dehydration as I've increased my protein intake. I've been off of the prohormone for a couple of days now and the pain in my lower back seems to be have gone but now I'm experiencing some discomfort in my stomach. As I've stopped taking the prohormones I've started my PCT (Post Cycle Therapy) which involves using a SERM called tamoxifen citrate to block the estrogen, prevent gynecomastia and return testes to their natural function. My other symptoms include going to the toilet frequently (up to 3 or 4 poos a day). My stools seem to be quite liquidy but sticky. I'm not sure what I should do.