What happened was that I was cutting the grass and I suddenly felt winded, huffing and puffing. Cutting the grass is something I had no problem doing in the past. I took my dog on a walk and halfway around the block, I was huffing and puffing again. I almost called my wife to come pick me up, but I rested and slowly continued. The dog was oblivious to what was happening.
My doctor had gotten my BP down to 110/64 which is the lowest it had been in years. But after the "exertional dyspnea", he now wants the blockage fixed ASAP. The Heart Cath will find the blockage and send a balloon to open it, or go on to a stent.
Wife is making me rest till then.