supplementing can be a slippery slope that leads to reduced supply. be sure you really need to before you do. remember that baby is better at increasing your supply than any pump, too. one thing LLL leaders often advise is to take a nursing day and just snuggle topless (both baby and mom) in your bed together all day and nurse nurse nurse. housework and everything else can wait. the more baby nurses the more milk mama makes. don't forget that baby will often want to nurse more during a growth spurt, too, to increase your supply. when your breasts start to produce more baby should go back to a more "normal" nursing pattern.
ita, that leaking stops. i remember being worried with my first dd when i stopped leaking, but all was well. my breasts just finally knew how much to make. i'm tandem nursing now and really am nursing all the d@#m time it seems like and i truly do have an abundant supply even though i've got two to feed.
i hope you can get through this. other things to increase supply besides the good stuff you're doing like fenugreek, lotsa fluids and nursing, nursing, nursing are oatmeal, mother's milk tea (has fenugreek, and fennel and other herbal galactalogues (sp) in it), oat milk (i used to use it on my cereal instead of cow's milk) and i'm sure there are tons more tips on those links the previous poster gave.
really, though, i just wanted to say to be sure you need to supplement. i have a friend who got bad breastfeeding advice and though she wanted to breastfeed she fell into the trap of supplementing early on due to wrong headed advice from hospital personnel and never did let her baby establish her supply. i feel bad that i wasn't able to help her more, so i'm probably overcompensating by offering too much advice here.