Itching away

I have an appointment to see an allergist next week, and I have to be off all antihistamine medication for a full week prior to that visit. I'm now in my third day without meds, and I'm feeling sick. My nose is running, yet congested, and my eyes and throat itch. I'm starting to itch all over my skin in random spots. It's the same whether I am indoors in air conditioning or outside in the summer sun. I'm glad this isn't contagious, but I really feel like crap the way I do when I am sick.