I had my surgery 12/4/07 and still occasionally have pain, especially around the port area. Not only can I feel the port, I can feel the band itself. I don't know why! I questioned the doctor before surgery about feeling the port, and his reply was "well, if people feel it, they aren't complaining about it!". There's just something about my particular anatomy, I guess, that allows me to feel the devices. I don't like it, but aside from having it removed, there's nothing to be done about it.
Back to the pain issue, some after a fill is normal, but continuous pain might be indicative of an infection. Do you have a fever, or even redness at the site? If so, call your doctor or nurse line and go in for them to look at it!
I had some of the internal stiches come to the surface and went in between fills to have them look at it. Don't hesitate to use the resources available!