How do you feel about antihistamines?

Asthmatic since I can remember, I've always had allergies on my skin and the never ending hay fever. About 5 years ago I found a combination that worked for me, Symbicord, a nasal spray and a antihistamine every single day. I do cardio also to just get my lungs and heart stronger. The antihistamine is not good when you're ttc, or during pregnancy. So I've cut sugar, gluten and dairy products from my diet to a large extent, since those are detrimental to the system of the allergic. I've also stopped using antihistamines and nasal spray. But I don't have the most success with this - still sneezing like a mofo sometimes. Is there anybody else that maybe experienced this? I can't exactly suffer through it as I'm prone to getting infections and get asthma attacks. Help?