Advice on writing chronic pain caused by a fairytale curse in a way that's not ableist?

Hello!

As the title says, I'm trying to write a fic where the main character lives in this sort of modern with magic world and has a curse-like illness that causes them physical pain when they get emotionally close to someone. I don't experience chronic pain myself, but I thought that since a big part of this character's story in canon is that whenever they get close to someone, it always ends in tragedy, and because some parts of their life resembles a fairytale, it would be interesting to try to explore their life in a sad fairytale sort of setting and do a character study on them and the pain they felt throughout their life.

The problem is that because of this I sometimes need to reimagine some parts of their life by writing plenty of graphic descriptions of them being in physical pain, and I would hate to accidentally come off as insensitive or ableist.

So, is there any advice you can give me? Any particular Do's or Don't's? Any sort of help would be very appreciated!