Is this an allergy attack or something else?

Elergies can start at anytime in your life. Its like one day your body stop making certain anti bodies. Your symptons sure sound like you having an elergy reaction to something that is growing or blooming in your region. If it percist, go see your doctor. Though there is no cure for elergies, there are ways to manage it. I use a nasal spray that pretty much took care of my hayfever.