Well I recently learned that the part of the brain that experiences physical pain is the same part that experiences emotional pain. So I say, confront the person like you're ripping off a glued-on bandaid (which I know is what it can emotionally feel like). The sooner it's over the less long you'll have to worry about what will happen.
I'm the same way - I hate confrontation/conflict of any kind... I suppose it's worse for me when I don't see it coming, when it comes from someone else. But either way it's hard! I once had to force myself to wake someone up from a nap (who I knew was in a bad mood) because she was going to be late for something. It was awful and it took me at least, like 10 minutes to build up to it :/ Also, I had to make a difficult phone call recently, so when someone dialed the number when I wasn't quite "ready" (to get me to stop procrastinating), it turned out to be a good thing. I think we, being empaths, just have to do this for ourselves when no one else is there to push out on "on stage" so to speak.
I feel your pain... Love & light to you, too Hope all goes well..