Find a bee keeper who has bees in your area and get some honeycomb. Chew a piece of it 2-3 times a day. It's waxy and looks dirty, but it's only the pollen in it. Spit it out when you don't taste any more sweetness in it.
Over time your body will build up its own immunity to the pollen in your area. If you move, you may have to find a different bee keeper in the new area you are in and start over.