First thing....RELAX!!! Stress can definitely effect your milk supply.
A lactation consultant can help you more than any of us can. I encourage you to find one. Ask your dr, or contact your local La Leche League to find a good one.
On facebook, I've found some great BFing resources. They each have their own websites, too, but I like the fb pages. Here are the links:
The Leaky B@@b: http://www.facebook.com/home.php?ref=home#!/TheLeakyBoob (I love this one!!!)
Best for Babes: http://www.facebook.com/home.php?ref=home#!/BestForBabes
Kelly Mom: http://www.facebook.com/home.php?ref=home#!/kellymomdotcom
Eating oatmeal (not instant) helps your milk supply, and of course drinking tons of water! You can also try mother's milk tea, or make lactation cookies (I know the Leaky B@@b has a recipe).
The best thing to do is let baby nurse as much as possible! Feed on demand, not a set schedule. The more LO nurses, the more milk your body will make.
Also, you can try 1 of 2 things: let baby nurse on one breast, and pump on the other (my LO hates this, so I don't do it). Or pump immediately after baby nurses (I did this for a short while when my LO was about 5 months old and my supply dropped a little). Even if it seems nothing, or very little, comes out, pump for 10 minutes on each side. This will help stimulate your supply.
GL, and yay for not giving up!