9 month old Hair Pulling

I am honestly having a break down right now because my baby has been struggling with his skin since around two months. They said it was eczema & they put him on everything you can think of and nothing is helping. My baby is constantly itching & I have tried EVERYTHING. I even switched pediatricians. I have taken him off of cereal & his formula so now is only on fruits, meats & veggies. He has a reaction to gluten as well as his formula. Since being off his skin does not look as bad. Now he is scratching his head & pulling his hair out. My heart is broken I’m a first time mom, alone, his father died & I do not know what to do or how to help my baby. I’m so sad but trying to stay strong for my baby.