I don't suffer but Mrs G does. With her it seems to be the early season tree pollen. Currently grass pollen is high but that doesn't bother her.
She takes the off the shelf antihistamine tablets. The active ingredient in them is one of two types, read the label, try both to see which one works best for you.
If you have a garden keep the grass short and don't grow the golden rod plant which is notorious for allergy sufferers.