I think having lapband triggered past bulimia, should i put a stop to it?

Yes , possible: You don't need large stomach ( you have very small pouch only ) to have bulimia, most likely you are eating very eating frequently very large amounts in shot time . Yes you have to put an end to this vicious circle , have to speak to your doctor(s) , besides you will need psychological counseling , ( you must seek this help ) this frequent purging may damage your body , .