Trying not to stress.

I'm sitting here thinking how much I wish I were out running. I was sidelined for Sunday's half-marathon and now I'm completely freaked out by the what ifs? Nothing has changed except some knowledge. Now my lack of breathing could possibly cause me to drop dead. I'm afraid to run and I hate feeling afraid of anything. It's bad enough being told what to do, but I don't know what to do with the fear. I hope the test is negative so that I can get back to my well-established routine and yet if it is inconclusive, I'm still in the same place with my lack of air. I'm feeling powerless right about now. I need to feel like I'm in charge and that I am making the choices rather than having them made for me.