I had the same problem so what I did was feed my baby in a cradle hold but I would lean back so that she was nursing uphill.
http://www.kellymom.com/bf/supply/fast-letdown.html
Got this from the Kellymom website go to the lin above as they also have some pictures.
Position baby so that she is nursing "uphill" in relation to mom's breast, where gravity is working against the flow of milk. The most effective positions are those where baby's head and throat are above the level of your nipple. Some nursing positions to try:
Cradle hold, but with mom leaning back (a recliner or lots of pillows helps)
Football hold, but with mom leaning back
Elevated football hold - like the football hold, but baby is sitting up and facing mom to nurse instead of lying down (good for nursing in public).
Side lying position - this allows baby to dribble the extra milk out of her mouth when it's coming too fast
Australian position (mom is "down under", aka posture feeding) - in this position, mom is lying on her back and baby is on top (facing down), tummy to tummy with mom. Avoid using this positioning frequently, as it may lead to plugged ducts.