Peanuts in Pregnancy

Hello. I am writing this in hopes to clear my conscious. I have an 11 month old who I am still breast feeding a couple times a day. I was not concerned of allergies, because I eat pretty healthy. Before I go any further, I did look into this topic when I was pregnant, because I have eaten the natural peanut butter at least once a day for the past 5 years. Yes I know I am somewhat of a fiend, but I am at a healthy weight, eat a variety of other foods, and exercise moderate to intensely every day. My heart has been broken lately though after giving my son a lick of my PB2 spoon. He immediately wiped his mouth, coughed and within 5 minutes, developed hives around his mouth. My husband is a physician and wanted to see for himself weeks later, so he gave him a lick of regular peanut butter. He still coughed, then became disinterested in eating and developed a red spot on his cheek. This occurrence was no where nearly as dramatic as with the PB2. A couple weeks later, he decided to try for the last time again with the PB2. Once again our son reacted just like the first introduction. Needless to say, I am heartbroken knowing my son will not get to enjoy a Pb sandwich, thai food, or peanuts at a baseball game. What did I do wrong? I was in transition to vegan during pregnancy, maybe ate meat 2 times a week. I have never been a fan of milk. I read somewhere recently that the peanut allergy was linked to breast feeding mothers who consumed peanuts. I believe the study was from Australia. The baby apparently is introduced to a protein in the peanut transmitted through the breast milk. So in connection with this video, should peanuts be avoided during breastfeeding? Is there anything at all I can do to desensitize my son? If I stop eating peanut butter, will it change anything?