Yesterday morning after moving 2 heavy trash cans I had a tightness in my chest that was still there an hour later, so I had Sharon take me down to Kaiser. They checked me in and did a few blood tests to see if I'd had a heart attack. Negative. Kept me over night for observation and this morning pumped me full of dye, ran a baseline, then more dye and a drug to make the body think I just ran a 10K. Heart arteries are all clear. Also the Dr. told me my heart pumps at a "79" and anything over "48" is fine. They don't know the cause. Waiting in the lobby for Sharon to pick me up.