I NEED HELP

Ok everyone I NEED HELP!!!!!!! Before the holiday i was doing great on my diet and then I had a week off from school for Christmas and now I cant get myself back on track! I had lost 7 pounds and I think I gained back like 4 of them..... I need some encouragement!!!!!!!!!!!!!!!HOw does everyone stay motivated and how do I get back on track? PLEASE HELP ME!!!!!!