How much is purging supposed to hurt?

I didn’t know how to word this but I purged after being clean for a month and a half and it hurts so bad. It genuinely feels like there’s sandpaper in my throat. It’s very difficult to swallow. Also, the back part of the roof of my mouth like right behind and to the sides of my uvula is really red. I just wanna know if this is normal and I just forgot because it’s been so long or if this is cause for concern??