It's ragweed season around here...don't know if you're in the same type of zone, but ragweed is notorious for causing all kinds of problems. My husband, who has very mild allergies is really suffering.
I have terrible pollen allergies anyway, so it's just one more pollen to me! Chances are your throat is sore from PND caused by the pollen.
Still, I will say that even post Nissen some reflux is possible. When the surgeon does the wrap, he/she is going for "normal" reflux, which is <14 DeMeester score. They want us to reflux the way our normal friends do...just occasionally, when we overdo it. If they were to do the wrap tight enough to ensure zero reflux at all times, you wouldn't be able to get food through. So could you have had some reflux? Sure. My bet is on the allergies, though.
Hang in there!
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”