What on earth can I eat?

My little boy has had digestion issues from about 1 week old. He's currently 6w4d. He's got reflux, but he also gets extremely bloated and cries after every time I breastfeed him. Once he poops, the bloating is gone and he stops crying. The pediatrician isn't sure what exactly is causing it, so she had me cut dairy, caffeine, chocolate, and gas inducing veggies out of my diet. Just went for his 6 week check up yesterday. Now, she wants me to cut out soy, wheat, and red meat too.

My question is, what on earth CAN I eat? Anyone have any suggestions? If I don't eat enough nutrients, I'm not going to make good milk for him. I'm frustrated to say the least. 😕