It sounds like you need a break hun, is there some other line of work that you can get into? I deal with customers too, but at times it's more than I can handle. Fortunately for me, I'm self employed in interior design, so the days I just can't, I don't.

Because of bipolar I can't work with others, so I started working like this.

Once I had a nice 2 week stay in a psych hospital...like locked in which made all the stress melt away. It was a nice one, so it wasn't too bad, of course it's like jail, but with the freedom to roam and socialize. They also adjusted my meds for the better.

I hope that you find a way before you break and do something that you'll truly regret. Hoping for you!