Chris, one "here's what happened" deserves another, eh?
Last year I went to the doctor for a "regular" check-up...blood test, weight, cholesterol...no biggie. A couple of days later he calls me at home, in the evening, and says "Craig, you have a big big problem. Your RBC is 5.5, and it should be 13. Have you been bleeding internally?"
Well, was I ever shocked. I'd been doing weight-lifting/aerobics at college, and was doing fine. I had no clue whatsoever that my blood count was that low. Dufus that I am, it never occurred to me that my hems (which had been acting up for several months) would require that I take iron supplements. So, my system was completely, and I mean completely, devoid of iron...hence, no new blood cells. The doctor said that his normal recommendation would be for me to get a couple of pints transfused right away. But we decided on a high-iron supplement diet...and in 3 months my RBC was back to normal.
All the upper and lower GI work that was done was to confirm that it wasn't internal bleeding (perforated ulcer, colon cancer, etc).
He said I need the same regimen every 3 years (I'm 51). Another 1.5 years to go LOL
Craig