Pain in stomach and intestine burning.

01st May: Had severe heartburn due to not eating and having raw whiskey(3pegs)  before night. Went to doctor and was prescribed NEXPRO RD-20 and I was fine after 2days. Did not drink after the incident. 14th May: Started to have constipation. 15th: Taken one laxative DULCOFLEX and passed motion comfortably on  that night. 16th: Started taking fiber supplement FREEGO. 18TH and 19TH Had mild persistent pain in left lower abdomen, which frees after going to bathroom. I was freaked out, out of panic went to gastroenterologist. 20th: Doctor suggested for abdominal scan for kidney stones or any other issues. Nothing found in abdominal ultrasound, everything was normal.  Doctor suggested PEGFIBER a fiber supplement to relieve constipation. 23rd: Underwent full body check-up out of doubt and everything was normal. I was feeling mild pain in stomach between chest bone and belly button. And was passing gas more than normal. So doctor suggested to use  RCON-LSR tab. No improvement.