Cinema,
My prayers are with you and your H. Hope it turns out to be something not to serious. I went to the Hosp. a while back for chest pains, turned out it was gastro-intestinal and my ticker is fine. Still, MrsG was a wreck. I know what you are going through...it is awful.
BTW, you did nothing wrong. So what if you were outside without the phone? You got the message and responded before he even reached the ER.
Oh yeah, don't sit at home. Go to the ER to be with him and to hear what they have to say.