Has anyone experienced excessive weight gain using Januvia? About...

Has anyone experienced excessive weight gain using Januvia? About 13 months ago I started taking J. and I've not lost any weight since that time. I had Lap-band surgery 19 months ago lost 58 lbs the first 7 months, started the Januvia, had what I thought was Lap-band problems, gained a few pounds and the few pounds are now a plus 40. I've spoken to a pharmacist and he says there cannot be any connection to Januvia, however I've begun to question Januvia as the advertisements on TV state that Januvia has not been tested with insulin and I'm taking Lantus at night and Januvia in AM. Januvia can be used with insulin at the description of the Doctor???? I'm very concerned about myself and Januvia. Any comments 2bears