At a standstill

Hi everyone! I had gastric bypass 11/02/12. I lost 30 lbs by Thanskgiving but since then I'm only down 5 more lbs. I work with a personal trainer and am doing all the food and water requirements but nothing is working and I'm getting depressed. I go back to work Mon and need to stay positive and focused. Anyone with advice or words of wisdom please reply! Have a great day!