I Have Very Bad Allergies. It Affects My Eyes Really

I have very bad allergies. It affects my eyes really badly so much that they swell up. Even when it's not that bad my eyes are extremly sensitive. I've tried so many antihistamine and find the result very dissapointing. I've been taking Celestamine now for a month. I take 1 every 12 hours. I tried at the beginning of the week to take 1 neo Clarityne in the morning and then the Celestamine at night but it didn't work. I'm 54 year old and I'm really not sure what to do. I'm love the result of the Celestamine. Can I continue with it ?