I don't think what you've been eating in the past 2 weeks strongly impacts iron levels. It's more of a long-term thing. You've either chronically not eaten enough iron, the iron you have eaten is not well absorbed, or you're bleeding somewhere. It would be easier to guess which if you go get a full blood test (I assume the blood donor place just did a quickie test?)
One simple one: Did you eat a lot of dairy with meals, prior to eliminating it? The calcium in dairy can prevent absorption of iron.
I was diagnosed with microcytic anemia about 6 weeks ago, almost certainly due to heavy periods (which doesn't apply to you, I know). I'm no longer anemic as of this week, just through cooking on cast iron and using just a small amount of Floradix to supplement. My ferritin is still a little low, so I'll keep supplementing for a while longer.
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food