I am afraid I don't have any advice, Phoenix is pretty clued up on this stuff though!
I just want to express an opinion that I dislike the fact that there isn't a lot of knowledge or support within the midwife or health visiting community for people, I personally think it should be a much bigger topic of theirs when they train to be these roles, I haven't ever heard of a baby NOT losing weight after birth! I think that you need to find a lactation consultant too, someone that actually has a clue what they are talking about.
Half the reason people don't bother with breastfeeding is lack of knowledge, but my goodness it pays off in the longrun if you breastfeed.
I hope you can find the support you need and get the right information given to you, and you can continue to breast feed happily - especially if you feeding is getting into a good routine, that is brilliant as that can be a struggle for some people.
I breastfed my daughter for 1 year and absolutely loved it and was very good at it too, I didn't get enough support, my ex mother in law was the best person in the world for me at the time and she supported me so much. If I hadn't have had her I don't know what I would have done because the health visitor wasn't supportive at all she was just worried about charts and growth and weight all the time! xx