Several times I have had a severe allergy "attack" after strenuous exercise outside. How can I prevent these?

Every time I finished the activity, had a 20-30 minute sneezing fit, then my nose ran for three days like a faucet. My energy was zapped. I take allegra D every day, and it controls my allergies except for when I put myself into a situation where my physical activity is maxed and my adrenaline is high.