My dd had horrible tummy issues when I was bfing.
Are you eating any soy products?
I would suggest cutting out milk AND soy for at least a month to see if there is a change. If the milk is in your system for 2 weeks it can stay in the babies that long to! So that's 4 weeks before you see a difference.
If you do decide to give up, I would encourage you to keep pumping. I was pressured into givin my LO neocate, after 6 months of battling bloody diapers and reflux and no sleep, and then realized that the neocate made no difference, and tried to go back to BFing but it was too late.
Melanie-Mommy to my HERO Madeline Parker
1/15/07-8/23/13 Fight For Maddie
our "Bumble Bean" Benjamin Patrick
1/19/13 and our "Little Bit" Eliotte Claire