urticaria
"I have suffered with chronic uticaria for over 10 years and over the last 6 months it has become a daily nightmare. Benadryl worked a bit but it was probably due to the sedating effect allowing me to sleep. However, I can now take 4 tablets and still itch. I've combined this with an H2 blocker such as Zantac and it helps enough to be able to sleep a couple of hours and then I'm awoken to intense itching."