Bad pain after ending fast please help

I ended a 5 day fast and broke it with liquids and I was fine. I ate one meal of a spicy bowl but only half as it caused pain. The previous two days I've been eating normal (1-2 meals a day) and its like after I have to fart or after I poop my anus and lower stomach hurts really bad. Like it feels like it's under pressure and it's really painful and I'm not sure why or how long it'll last.