Fennel tea like all these galactagogues can work but doesn't always, and you have to drink an awful lot of it to have an effect.
Oats, fennel, fenugreek, aniseed... the list of herbal galactagogues is pretty long actually but looking at your situation it sounds like you might need professional help - like your BFC - as what you're essentially doing is trying to relactate unless I've read this wrong?
Relactation info from Kellymom.
Some things to look into or ask your BFC about (see if she thinks they are worth trying) are:
Supplemental nursing system. This is so you can still ensure your baby is getting fed, but all his sucking is at the breast, which in turn stimulates your milk supply.
Domperidone, also known as Motillium. This is an anti-sickness medicine which has the side effect - iirc - of increasing prolactin levels which in turn increase your milk supply.
Biological Nurturing, or self attachment. Worth looking at if your baby is under six weeks old; this can help your baby latch on... I have seen a baby that had really bad nipple confusion (lots of bottles and didn't want to suck at the breast as a result) latch on by herself and suck at the breast using this method.
It might also be worth looking into getting a really good pump; perhaps contact your local NCT branch to see if you can hire one that lets you pump both sides at the same time? Obviously your baby is the best stimulator of your supply but only if he is sucking effectively. Otherwise a good pump is better.
But do make sure you discuss all this with your BFC and see what she thinks as she will be very clued up I would have thought.
Good luck!