Bloated belly. gass passed, poop

After eating lunch i feel i can eat more but my stomach feel like full..I go to poop 1-3 times. sometime i feel need to poop not urgent but i feel discomfort.then i go for bowel movement and large amount of gas passed only..Then poop sensetion gone.I feel this problem when i am out of my house.when i stayed home i go 1-2 times for poop.Please help i am very much disturbed it disturbing my work life.Help.anal fistula also i have grade 3.A thin hyperintense track with surrounding inflammatory changes is seen originating in the natal cleft in cms traversing the transphincteric plane with right paramedian location extending for length of 3.5 internal opening at 6' o clock. The internal opening is around 1.9 cms from anal verge. No supra-levator extension of the track. No evidence of collection/abscess seen in the present study. The pelvic organs appear normal. No obvious significant pelvic lymphadenopathy. Rest of the pelvic organs appear normal. Visualized bones appear normal.