A few years ago, I had to stop giving blood as my iron count dropped far too low. I'd always had slightly low iron, but my deficiency had started getting worse and worse.
While at University, it got to the point where I became incredibly lethargic. I got tired and depressed very easily, and had trouble motivating myself to do anything. This was partially due to my circumstances, but also partially due to my iron-deficiency. I was taking mineral suppliments, but even these were not raising my iron levels enough to make a difference.
I started taking Ferrous Sulphate tablets in the summer of this year and have noticed an improvement. Although I'm still not totally fixed, just taking one of these everyday has certainly made my blood look less pink, and I don't get tired as easily as I used to. I'm hoping that if I keep taking them, eventually I'll be able to give blood again.