How do I know if its seasonal allergies?

canadianboy1991 asked:Okay,here aremysymptoms:Mild Headache Congested sinuses runny nose

I checked theweather andtheysaidtree pollen orsomething washigh,soitwouldbelogical thatitsallergies buthowcanI find out forsure? shouldi take anymedication tosooth someofthesyptoms? (advil [...]