Sever Allergies

So I have suffered from daily allergies all of my life. Every winter I would be so sick I would miss tons of school, at least a month every year. I thought I had a horrible immune system, and was really embarrased that I was always sick. Just recently I was diagnosed with rhinitis and given a steroid nasal spary. It worked for two months. My symptoms are back. I'm dizzy, exhausted, sometimes confused. I feel disoriented at
times, have headaches and migraines. I have trouble working and am having vision problems. My pupils will dialate and throw me off. Can all of this be caused by allergies?  I'm so frustrated. Tired of feeling so icky ALL OF THE TIME.