Dealing with Hives on Xolair: Seeking Advice

I just started Xolair and am weaning off of steroids. None of the antihistamines ever did anything for me. I am also starting hydroxychloroquine because they think my diagnosis lies more firmly in the vasculitis area. I thought those red stretch mark things were just me :/ I still have a few hives pop through but they don't stay as long, but I'm concerned about what will happen once my steroid taper is decreased further, I guess.

I’ve been on Xolair for almost two years with monthly injections. About week 3 day 4,5,6 I have to add in Xyzal. If it’s really bad due to what I have eaten or stress I have to add Xyzal along with Famotidine and something that the name is escaping me right now. Basically life is “ normal” two days after my injections until week 3 day 4,5,6. I avoid foods that are naturally high in histamines ( tomatoes, cucumbers, spinach…..) week 3 all together even though I LOVE eating this healthy vegetables.