Glo,
I second what OH Juli says. I'd just add that whatever is causing your sinus drainage--like allergies, or maybe some low grade upper respiratory infection--probably has an inflammatory process as part of it. This inflammation can affect your whole body including your stomach and might be part of why you are having heartburn--so even if your restriction was fine before, now your stomach is a little inflammed which causes your restriction to be too tight. We all know a little irritation or inflammation of the stomach can turn into a vicious cycle--eating makes it more inflammed, which makes it more swollen, then eating again makes it worse, etc.
The good news about that is if it's inflammation making your restriction too tight, if you get a small unfill and let it rest while the inflammation resolves, you should be back in business pretty soon and able to get filled again. Whatever the cause, though, the first thing we should be thinking about when we have reflux problems is the band. The band is ALWAYS the cause until proven otherwise, and until it is definitively determined that the band ISN'T the reason for the reflux, you have to be thinking about reducing your fill unless you're interested in swelling, irritation and ultimately slippage or erosion. The last thing to do is take medication for reflux, otherwise you can just cover up the symptoms without addressing the cause. Now that we're banded, we should only be taking anti reflux meds after our band docs determine that the band isn't the cause and give us the green light.
New reflux=see your band doc!