HealthDay: A cold winter followed by a sudden and sustained warming trend, not to mention the botanical blossoming that global warming has brought, has boosted pollen counts to near-record highs across the United States this spring, experts say. All of that has led to one of the most miserable allergy seasons in recent memory for the 50 million Americans who find themselves suffering itchy eyes, runny noses and scratchy throats this time of year. “In Atlanta, we recently saw the second …