M.G.
My milk dried up when my daughter was 2 months old. Before the 2 month mark, it was a smaller and smaller amount each week. I had to supplement from week two. I also had to find which formula fit my little one, as the iron based formulas made her sick... I finally found Prosobee - awesome stuff.
I know it kinda bites hiney, but it's possible that your milk is just not reproducing very well... :(