Stomach and Ano-Rectal related. Help.

Since last 1.5 years i have been suffering from a different and undiagnosed problem. Before starting this health problem i decided to perform some physical exercises due to my sedentary life style and permanent night shifts, but at that time I did not have any health issue. So I started doing Ab Roller exercise without any warm up excercises at home. One day i felt numbness in my stomach, i could not get away straight from my bed. I pushed my bed with my both hands to lift my body. I also felt some discomfort in my anal rectal region. I faced problem while passing bowels because I was not able to put pressure/push on my rectum. Since that day I was not able to empty my bowels completely and involuntary gas leakage stared. Doctors says it's IBS and they performed sigmoidscope and diagnosed Internal haemorrhoid. I always experience pressure on my rectum due to gas. This pressure increases when I am under stress and tension or in fear (mostly in social situations). please help.