If you believe you have an environmental illness, first consider your symptoms. If your symptoms are severe (for example, you are having trouble breathing), you have ingested household chemicals, or you fear you may have a carbon monoxide leak in your home, call your Poison Control Center immediately. Otherwise, contact:
Putzing in the garden is nothing less than therapy. It's even good exercise, if you exert enough effort. But the sneezing and stuffy-headed feeling that lingers afterwards -- that's the downside of gardening with allergies.