Adderall and pills

I AM ON ADERALL XR AS AN ADULT FOR ABOUT 5 YEARS NOW. I AM 34. I TAKE ONE 20 MG PILL A DAY AND HAVE HAD SOME CRAZY MOOD SWINGS. I FIGURED IT WAS MY AGE WITH NO KIDS. ONE GOOD THING IS THAT IT HAS HELPED ME CONCENTRATE AND IT HAS HELPED ME STAY THIN! ALTHOUGH, RECENTLY I HAVE BEEN GAINING WEIGHT. IM NOT SURE WHY, IM DOING THE SAME THINGS. I GAINED 10 LBS IN 3 MONTHS. I DID GO FROM ADDERALL TO ADDERALL XR, BUT MY DOCTOR HAS BEEN SWITCHING ME THE WHOLE TIME IVE BEEN TAKING IT. IVE ALSO HAD WEIRD STOMACH GURGLES AND STRANGE OTHER PROBLEMS WITH MY BUTT. NOT SURE IF THEY RELATE, BUT I REALLY AM JUST LOOKING FOR OTHERS WITH THE SAME ISSUES. THANKS. DO THESE PILLS EVENTUALLY STOP WORKING?