Hi H. -
Good for you for sticking with breastfeeding like you are. It's tough work when you have supply problems. I haven't read everyone else's replies yet, so sorry if I duplicate. But I too had very difficult supply issues, so here's what I learned.
First off, the book "Making More Milk" is awesome. It walks through different things to help you figure out if the issue is with you, with the baby, etc. And it also makes you feel like you're still normal even though you're having supply issues.
If the oats, fenugreek, etc. are helping, I would suggest seeing if your doctor would prescribe Domperidone. You can't get it in the US, but after researching it thoroughly and talking to others I know who took it, I felt comfortable taking it. Reglan has a common side effect of depression, so I think Domperidone is a lot better. Dr. Jack Newman, a breastfeeding guru in Canada, is a big supporter of Domperidone.
Also, not all LLL people are LCs, but I know of one that is. She also does the Mommy Cafe at Be By Baby, if that's where you went. Anyhow, did that person look for tongue-tie in your son? That can also cause difficulties.
Have your hormones been checked? Imbalances in your hormones (such as your thyroid going out of whack post-baby) can cause problems with production. If you haven't had that checked, I would definitely recommend you ask your doctor to do that. The Making More Milk book also has some tips in that area, if I remember correctly.
In my case, after 6 months of talking to about 6 LCs and working through that book, I determined that my supply problems were mainly due to a hormone imbalance that didn't allow for proper milk-making breast tissue development. Also, my thyroid went out of whack post-baby, and my son was tongue-tied on top of it all. So I was able to maximize my personal supply, but I never made enough for him due to my lack of proper tissue. However, we worked out a balance of formula and nursing, and now he's 14 months and still nursing! So no matter what, you're doing a great job!
Also, 2 of my LCs worked through the book with me. I got a prescription from our ped for "feeding difficulties" and insurance reimbursed me. So if you would be up for seeing more LCs, even at this point, it could possibly help. (And I can give you their names if you'd like.)
If you ever want to talk to me, just as another person with supply problems, please don't hesitate to send me a message!