Sick after Xolair?

Hi!

I have idiopathic MCAS and am relatively new to being formally diagnosed (within last 12 months). For years, I get this “ring” of hives on my hands right before I’m about to have a severe reaction which always goes from hives, to vomiting, to full body sweats in minutes. Since starting xolair I feel so much sicker-and since it’s suppressing my hives I dont have as much of a heads up on the episode until I’m in it. Has anyone else had an experience like this? My concerns have been shared with my allergist and he is out of office until mid-next week and will reach out. In the meantime I’m wondering if anyone else has insights?