Oh my goodness, this post could have been written about me. I SOOO feel for you and what you're going through. The past year has been hell for me with my HA. I've thought I had MS, Lupus, brain tumor, uterine/ovarian cancer, and God knows what else that I'm forgetting. I've had about every blood test known to man and a couple scans and pelvic u/s and everything has come back fine. My doctor told me that white counts often fluctuate and are not at all a concern unless it's been consistently low, like REALLY low. Last time yours was a 6 which is great. Testing once at a 3 isn't concerning to doctors because more than likely the next time it will have gone back up. I also read that anxiety can cause reduced WBC. As for the low ferritin, could you be anemic (with the 16 day period)?