Hi welcome to Health care magic forum.
You had burning and lower abdominal pain
You had pain in left shoulder, more on movement.
behind the left rib cage
You have got plenty of pus cells in urine indicates that you are having urinary tract infection
Causes of shoulder and back pain
suggests that it may be orthopedic , Or pains secondary to the U.T.I. or may be pain due to ascending infection of the U.T.I.
I advise you to consult a urologist
for diagnosis and treatment. You may have to go for M.R.I. culture and sensitivity of the urine besides other routine tests for confirmation.
Wishing for a quick and complete recovery, and thanks for calling H.C.M.F.