Context: Am Sysadmin, occasionally a programming job flies in.

I just told my superiors that i will can no longer program for a specific customer i already poured ~90hrs into due to stress and thus health issues that have been accumulating since the beginning of the year. Everything relating to this customer is giving me chills. I can't even do my other stuff without hinderance anymore.

Because this is in parrallel to an existing customer complaint that came in yesterday i just received a rather rant-y email about what the fuck would be wrong with me, which immidiately disappeared again.
It was revoked as i now know. So far they seem to be understanding, but i still don't feel good with the decision i made.

I really want to finish the project, but i just can't. It drives me insane. I never felt like this.

Sorry for the wall of text and any errors. I'm really not having a good time right now.