Thank you for the query.
Your symptoms can be caused by stress indeed. But 4 months is long enough to start some diagnostics and find the reason. Your symptoms can be caused by peptic ulcer
(upper middle abdominal pain
which appears after a meal), gallstones (upper right abdominal pain radiating to the back), urinary tract infection
(lower abdominal pain radiating to the one side back, frequent urinating, burning when urinating), large intestine diseases (blood in stool
, diarrheas and/or constipations), uterine and ovaries disease and IBS.
You should start with abdominal ultrasound, full blood work, liver tests, amylase, bilirubin, urine analysis. Upper GI endoscopy should be done and transvaginal ultrasound
If no findings, stool tests and FOBT (feccal occult blood test) should be performed.
Hope this will help.