Anal Ulcer. Long will this take to heal?

I was experiencing anal discomfort. I visited a doctor who has diagnosed my problem as Anal Ulcer. Added to it, i have burnt myself in the anal area, including the ulcer, while doing the hot sitz bath as a home remedy. On probing my history, the doctor concluded that i might have gotten the ulcer after consuming Sodox Antioxidant capsule on an empty stomach for 3 days. He's now given me painkillers, antibiotics, deworming taken, and nutrifiber for stools. He's asked me to take a cold sitz bath if required. He's suggested not to use any ointment over the ulcer, so it heals naturally. My question is, can Sodox Antioxidant capsule on an empty stomach give ulcers in the anal area? How long will this take to heal? Will keeping the ulcer area dry help heal faster as i am scared that a heavy fart on dry ulcer can hurt more (i am currently bloated due to wrong medication and hence the forced gas)