although i know little about it as yet to have fills.
i have read of a lot of people that get this problem, its usually after there fill, you can handle the liquid but the next day you cant ,
and have read and been told its due to your stomach swelling around the band ,as its not supposed to be there really and most people persevere for a week and a bit and find that slowly they can start eating or drinking more as the swelling subsides so dont worry to much but if it carries on a de fill may be worth it. but a band effects people differently so go by how you feel xx