When Do You Go To ER?

I spent a really annoying day Friday. I woke up sore over my of my torso. I decided I'd over done things. I figured I'd been at the house work to hard. After all, I spent 2 days cleaning up and doing laundry. I was up and down the stairs over and over again. For most of the day I was fine with moments of OMG that hurts. At night, when I was about to go to sleep, I got really short of breath. It feels like I have bronchitis to go with the scar tissue in my lungs. No fever though so I'm currently holding off on going to the ER. That may change by morning. If I have to call in sick again I think that will mean I'm going to the hospital though.