allergies?

Hi these are my symptoms that I have been dealing with for over a year now, I had a skin prick test that came back negative but I had only been off my antihistamines for 3 days and was on a beta blocker too.
I have-
scratchy eyes
post nasal drip
sore sinuses
some sneezing
swollen turbinates
sore chest- tight to breathe
fatigue

All my symptoms sound like allergies except my skin test came back negative and I cant really seem to pinpoint what I am allergic to...
any suggestions?