No breast milk.

I had my son two weeks ago and have been trying to only breastfeed. As he's gotten older his need for milk has increased and my milk production has stayed the same. I feed him 7-15 min on each breast, sometimes more, and he's still hungry. We've been supplementing but I feel horrible that I can't feed my baby. I've been trying just about every trick in the book to increase supply and it just doesn't do anything. I'm drinking
Mothers milk tea, ovaltine, 10-8oz glasses of water a day, and lactation bites with flax seed and brewers yeast. Does anyone have any suggestions?