Breastfed baby with food allergies

So I’ve posted a couple times about trying to figure out something to help my colicky/gassy baby. His dr has recommended he only consume baby foods that I’ve made from scratch and to ease him in with literally like two bites per meal. He went 13 days with no baby food at all and I didn’t notice a difference. We started yesterday with two bites per meal of homemade baby food and he seemed the same as he has been for the last two months (extremely gassy). I’m starting to wonder if he could possibly have an allergy to something I’m consuming. Has anybody else dealt with this? Basically his symptoms are constipation that will not ease unless he’s given a prescribed laxative, extremely gassy that smells awful and his belly is just upset all the time. We’re using gas drops and different things like that to try to help with the gas but I’d like to try to figure out the cause. He’s waking a lot during the night crying because his belly hurts and I just feel so bad for him. Any ideas or anybody dealt with this? It seems to be worse at night.