Sounds exactly what I am going through. Have you had your thyroid physically and chemically checked? I have only been suffering for 2 years now though but basically the same treatments and answers, or lack there of. I take Allegra + Zantac during day and Zyrtec + Zantac at night, however, Zyrtec only if I am bad, because it makes me zombieish! I experience SEVERE lip swelling, sometimes eyes, at least once a week. The only allergies that came up during testing were grass and tree pollen...but it does explain why I am a lot worse in the spring and summer.