If this came on suddenly, then you might be mostly dealing w/enviro allergies. Pollen is very high right now where I am...
If this is something that's year-round, then it might be from food.
These are 2 very good informative videos, Dr. Becker explains the difference between the two & how to avoid them.
https://www.youtube.com/watch?v=MeEWRNs13u8 https://www.youtube.com/watch?v=n7weEkUuhhk