go to hollland and barret and but some fenugreek and start taking 3 capsuls 3 times a day to boost your supply
also feed often - take a nursing holiday where you spend the day in bed feeding and watching films - the more you feed the more you will make
2 cups of fennel tea a day can help with your let down
also some people who have plently of milk to feed baby can not express a great deal of milk out - dont judge your milk supply by your expressed amounts
if your baby weight is an issue go to the doctor and ask to be prescribed domperidone - its an indegestion tablet that increases milk supply - i had to do this and without it i would never of been able to breastfeed how i am now
dont give up - its worth fighting for
http://www.kellymom.com/BF/supply/low-supply.html