I'm not sure if your surgeon told you, but even with the Nissen surgery, you can still get some reflux. If the wrap was made tight enough to keep absolutely all reflux in the stomach, it would be too tight to get food past it and into your stomach. The goal instead, is get us to a reflux level that is "normal"...much like those friends who seem to be able to eat anything MOST of the time.
It's pretty common to feel some reflux/irritation during those times when we're overdoing it, and maybe eating more trigger foods. It takes time for things to settle down again, and for any irritation to heal. Remember that your esophagus is a "dumb organ", and irritation can feel like reflux.
Try not to panic. It's unlikely you're headed toward your pre-surgery condition. Consider adding Zantac or even a PPI until things settle down again. I'm not sure what you're describing as "spray". If you're noticing problems when lying down try elevating the head of your bed, or a wedge, until you have things settled down and back to normal.
Good luck with your appointment and endoscopy!
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.”