Hemorrhoids from last 14 years. Farts.

I have had non bleeding external hemorrhoids for the last 14 years. It comes every 2-3 years and heals by itself within a week or so. This time, it's been almost 2 months but isn't fully gone. Earlier it was bleeding as well from an ulcer present on the canal (diagnosed in Sigmoidoscopy), finally it has stopped bleeding from 5-6 days as my doctor also said external swelling is improved. I have tried everything including 2 times sitz bath, Dafflon 500 (2 weeks) plus Sitcom LD course recommended by the doctor. Even the constipation is improved as I take peg fiber in night including Papaya and fruits throughout the day and early morning by 7 everything gets cleared. But I have severe swelling and pain starts from 9 am and gets peak at around 12.30-1 in the afternoon which gets relieved by farts by 2.30 pm everyday. I like to understand the reason behind it. I have tried going to the bathroom as well a second time but I don't put any pressure and there's no poop, only farts.