antihistamines usually have a calming effect.. ie: benadryl. What are you taking? Decongestants will make you more panicy, they have an 'upper' effect.
Anything like Zyrtec and Claritin should not have any effect on your mood.
Also, sinus washes are also a non drug way to corabat allergies.
I have bad sinus problems along with my anxiety. I was prescribed Claritin and also told to take Benedryl and Ocean brand Nasal Saline to wash out my nose. I was also given a nasal spray but never used it because im scared to spray anything in my nose.