The whole mid-west is filled with pollen and allergens of all kinds, all season long. One that gets everyone, to some degree, is giant rag-weed pollen. It looks like a spiked mace ball under the microscope, and is a physical irritant to everyone, with additional allergy symptoms in many.

I like the generic version of "Claratin" (loratadine), and supplement that with pseudo-ephedrine (pain in the rear now, due to additional regulations intended to curb Meth labs). But they are both inexpensive and effective, at least for me. Never tried the Visene allergy formula, but I use a lot of the regular type.

Medication helps, but if you are that sensitive, you may be afflicted for the duration of your stay in the mid-west, I am afraid. Good luck to you.