I think that sitting down on my chair deformed my anus. i smell like poop and the bottom part of my anus feels loose. do i need reconstructive surgery?

Unlikely due2 sittin: This is unlikely due to sitting unless you satin a chair for with prolonged and unrelieved pressure for hours at a time. See your internist for more likely explanations of this problem.

It's not from...: Sitting on your chair. See your family doctor for a preliminary evaluation, and they can see if you need a referral to a specialist.

Sounds like anal : Leakage/discharge. You mentioned fecal retention which can lead to overflow incontinence. It happens in people who get impacted because of severe constipation this can also be asociated with weak sphincter muscles which can lead to having poor control on your bms. You will need a detailed anorectal exam evaluation of sphincter muscles. Please see a colorectal surgeon.