I typically have a sharp pain in my rectum with gas. But I cannot feel that I have gas. To relieve the pain, I sit on the toilet and 'strain' a bit, and pass a little gas bubble, a tiny fart. The sharp pain in my rectum for me is usually at night, and wakes me up. I picture the pain as perhaps a fold of some kind in my rectum. I had to go back to the doctor after the baby was born, reopen my episiotomy and resew it back up. Hugest hemmorroid he'd ever seen he said, and he showed all of the staff.