How do you cope with knowing a beloved parent is having potentially serious medical issues?

I just got a call that my mother has been having heart trouble and has “abnormal EKG results”. A heart cath procedure is planned. I’m totally wrecked right now and can’t frikkin think straight.

They’re not doing the heart cath for a few days and I don’t know how to keep functioning properly in the meantime.

How do you “keep on keepin’ on” when you’re on pins and needles, waiting to hear what the next step is?