How To Treat Tightness And Pain In Abdomen Despite Being Diagnosed With IBS?

HELLO, I WAS DIAGNOSED WITH IRRITABL BOWL SYNDROME BACK IN NOVEMBER AND PRESCRIBED MEDICINE. THE RIGHT SIDE OF MY UPPER ADBDOMEN WAS TIGHT, WITH PRESSURE BUT IT WENT AWAY IN DECEMBER AND NEVER HURT AGAIN SO QUIT TAKING MY MEDS. 2 WEEKAGO I STARTED HURTING AGAIN AND STARTED TAKING MY MEDS GAIN AND THE PAIN AND PRESSURE WILL NOT GO AWAY EVEN THOUGH I AM GOING TO THE BATHROOM DAILYY. I HAVE AN APPOINTMENT WITH MY STOMACH DOCTOR ON THURSDAY BUT THE PAIN AND PRESSURE SEEMS TO GET WORSE EACH DAY AND DIDN T KNOW IF I SHOULD BE CONCERNED? I HAVE HAD MY APPENDIX REMOVED AND THEY RAN TESTS BACK IN NOVEMBER ON MY GALLBLADDER AND EVERYTHING WORKING OK. SHOULD I BE WORRIED?