New and Confused… about Setons

I am new here and unfortunately was recently told by my colorectal surgeon that I have a complicated (high) fistula and need to have a seton put in. And this will be taking place in a couple of days I was told I don’t have Crohns and that I am just “unlucky”. My fistula doesn’t really cause any pain or symptoms, except when it starts to abscess, and then it is really painful. I’m worried that having this seton surgery will make my symptoms worse. I don’t know how…