L.M.
I can say "I know how you feel". It was very disheartening to see my milk supply diminish with my first baby, and I was borderline panicked about it for her entire first year. I took all kinds of herbal supplements on the advice of a nutritionist (I'd recommend seeing one if you haven't already) - all easily researchable. She also recommended that I increase my intake of eggs, oatmeal and avocado. However, what produced the best results for me was a prescription med given to me by my OB for Reglan, which is actually heartburn medication that has a side effect of stimulating your milk supply. I never got a ton of milk (maybe about 4 ounces total per pumping session) but I was able to exclusively breastfeed and my daughter often didn't even finish the full 4oz, so I suppose that was enough for her. She's now 2.5 and super tall, strong, healthy, energetic so after all that worrying that she'd be underweight and sickly, it worked out perfectly. I wish I hadn't worried so much.
I'm pregnant with #2 and will ask for the Reglan earlier this time. I hated the idea of a prescription med, but I have to say that it worked really well.