It seems like my allergies are flaring up lately, since we're in the late summer and we've been getting tons of rain.
Same here. I have bad hay fever cos of the aspen fluffs. Allergies also include food allergies, dermatitis, asthma, and anaphylaxis
I'm allergic to Septra. Do you know what causes allergies to medications?
Could be environmental or genetic. In any case, an allergy is always your body's immune system over-responding to a perceived threat
Maybe I have a weak immune system. They are always so bad when the seasons change!
No it's the opposite - means your immune system is too strong and vigilant. Season change is common - a lot of people are allergic to pollen 
That dastardly pollen! I wish it would all go away! Is there anything I can do to lessen the effect of pollen allergies?
Well you want to lessen the effect of your body's anti-inflammatory response (usually histamines). You can try OTC pills, and if those don't work there are shots and other treatments available from your doctor