I have been getting allergy shots for almost a year. When I started, I had no reaction except for an occasional large red swelling at the injection site. Then I switched allergy docs and now I got full-body red itchy rashes almost every time I get a shot. We end repeating a lot of shots and I also now take Xyzal before shots. I'm worried though. Is is a normal reaction to get full body itching after an allergy shot?