Lisalisa - hi!
I took fenugreek with great success.
fenugreek
domperidone
I don't recall the dosage, but they were standard capsules from a healthfood shop, probably a make called BioCare, or alternatively Solgar. I took 1 capsule on the first day, 2 on the second, and so on, increasign to 6 capsules per day. When I felt comfortable with my milk supply I reduced the dosage very slowly. If it felt necessary I adjusted up or down. I never took more than 6 per day. Unfortunately I can't recall why I chose that dosage - I must have done some research. I do remember that it is important to increase and decrease slowly - the slow increase is so that you don't get a sudden engorgement, and the slow decrease is because fenugreek is very rich in soluble fibre and bulks out your poos, so suddenly stoppng it when your body is used to it might make you a little constipated.
I don't think I ever felt the need to take it for more than a month at a time, but did use it several times, the last time being when dd was 9m and had a bout of gastroenteritis and was feeding constantly.
One of the ways I could tell that the fenugreek was working was that I could feel it in my armpits, which is the only place I have ever been engorged (not while taking fenugreek though).
Also, the sling really does work. I used a borrowed Huggababy for about 9m, and bought a Coorie 6 or8 months later. I could feed easily in the Huggababy while doing other things, as long as the other jobs didn't involve too much bending over. The sling took the weight, one hand lightly cradled the baby and kept her close to the boob, the other hand was free to be used. The advantage of the H over the C is that the H is more adjustable, but the C was more comfortable. I fed dd in the C as well, but she was over a year and I don't think I could have done it on the move - standing still was OK, but not if I had had to be moving around and doing other things as well.
Are you bedsharing? Normally I wouldn't say to increase nighttime feeds if daytime feeds aren't working, but perhaps in this case, if you can feed without waking and being too badly disturbed, it might help.
Have confidence in yourself. You're a good mum and an experienced one. You know that however things work out you'll do well by your child. And it's not too late to reverse the pattern. I did that, starting at 6w, with ds, when I was in exactly the same situation as you. The difference3 was that he was my first! But then, I also did it without fenugreek.