Rhinitis Treatment Care

I have had allergies most of my life. I just started IT shots but they won’t work for a while. I’m very sensitive to the medications, all of them. I gain weight. I started taking singulair and using astelin but I’ve gained 5 lbs in a short time. This was the medication that my doctor gave me hoping to avoid the weight gain. Oh I forgot to mention that I am to start using Alegra in a couple of weeks for added protection against my spring hay fever. Does anyone have any suggestions? I’m getting tired of this.