You didn't say but since you mentioned the Cardiac Catherization Lab I'm assuming you had some stents inserted to open up a blockage? Correct? Or maybe they just were doing the scope to look at the arteries.
Take care of yourself now and even though you feel fine there is process to getting back up to full speed. It takes some time so don't rush it. If they will let you, go to the Cardiac Rehab if they have one available. Those nurses really know their stuff and will have you on the treadmills, bikes, rowers, etc. and most likely you'll feel much stronger than before your attack when you complete the rehab cycle.
Again good luck..... And yes the aspirin do work. In fact I had been taking an 81 gr baby aspirin for a few years when I had my attack. I think that alone helped a bunch and now take a 325 everyday as I'm sure you will.....
Can't keep a Buffalo down.....
I have been taking the baby aspirin daily for years, also--but that didn't seem to ward off the attack. (It might have postponed it for years, though--who knows?)
Tomorrow, we are going to the treadmill store. I've been given reams of material to read about proper exercise.