It could be viral, but I'm not sure how common that is. And if it is viral, of course, a round of antibiotics won't do a thing. That itchy, tight feeling goes along with congestion and also bronchial inflammation. The inflammation is basically what asthma is, and that tends to go with allergies even if you've never had an acute attack or been formally diagnosed with it before.

Wish I could listen to your chest with a stethoscope. Get one of your colleagues to do that and tell you what he hears!