its been 2 1/2 years since my lb surgery and i have reached my fill limit. the problem i am having is that i have gained almost 15lbs. is there a way i can get another fill

There's a good chance you can---ask your doctor. A bt of the fill may have dissipated with time. (No one really knows why this happens, but people often need to be "topped off.") But even if not, most bands seem to have a max capacity that far exceeds the number of ccs they're labeled with.

Do you think the reason for your gain is that you're not restricted adequately, or are you choosing foods that bypass the band easily? If you're veering toward old habits (and slider foods), a fill alone might not do the trick for you.