Possible sinus infection

Patient: I am feeling sluggish and when I stand up to walk, I get dizzy. When I breath in through my nose, I feel pressure. Also, when I move my eyes from left to right, while walking, I get really dizzy. I have had sinus infections in the past so could this be another one? If this is a sinus infection, why do I feel so off balanced when I am walking? I am currently getting allergy shots.