Making weight! Any tips would be amazing!

I'm going into the National Guard. All but in guys! I've gotta do MEPS (Military Entrance Processing Station) on the 19-20 of this month. I'm 5'6" and have to be 160 lbs. I was 165 a week and a half ago. I dropped down to 160.5 in two days. Then I put on a pound and I'm 161.5. Help! I'm dieting and running! No fast food, and no ice cream. I also try to stay away from cookies, cake, Christmas candy, and any junk food. I'm stuck at 161.5. Idk what to do! I've been at this for 3 days now! I really can't put on any weight in muscle so doing anything more than running is out of the question. Please help a girl out!