Seasonal Allergies??

I think Hiro has season allergies. The past week, he's been sneezing, runny nose, pawing at his eye cause he has EYE GOOP!! This morning his eye goops looked really bad. I called the vet on Saturday and they recommend me bringing him in. That's a minimum $60 just for the check up and then also meds. O_o He has an appointment with the vet this Wednesday. Some people have been giving their dogs benedryl if they have seasonal allergies. I wonder if they give it to them everyday during the spring. I would hate to medicate Hiro for that long. Does your dog have seasonal allergies?