kellymom.com :: Fenugreek for Increasing Milk Supply - fenugreek is probably not a good idea.

There isn't much you can do other than let him feed as he wants to. Your body is going to keep making hormones that will reduce your milk supply - and he's just going to have to learn to deal with it. You may be able to get more out by giving him each side twice at a feed, but that's all I can think of.

As for the EBM, try it in a normal (not sippy) cup with you helping, or even on his cereal!