Allergic Rhinitis

Patient: I was diagnosed with Allergic Rhinitis, but I believe it is more severe than that because it causes me to feel weird,when I am driving. I was told that my nasal cavity are completely closed. Could that be a reason why I feel weird when driving. Like I am impaired. I have not driven in 2 weeks. I am getting worried now. Can you please explain to me what can be the problem