I fixed my plateau pretty quick, after i realized what the issue was. If you see a trainer (and work out) several times every week and only eat 1200 calories per day, then I'd say you don't eat ENOUGH. Your body might think that you're starving. See my bio page here on FatSecret for a possible solution. I have been right where you seem to be, and I fixed it.
I hope it helps. Stalling is no fun.
"Losing weight is never about eating as little as possible"
"You wouldn't worry so much about what others think of you if you realized how seldom they do.
― Eleanor Roosevelt
"Do. Or do not. There is no trying."
- Master Yoda.
From October 4th 2010 to April 3rd 2012 I lost half my body weight - 80 kilos/170 lbs. Since then, I have had two cosmetic surgeries to remove excess skin. I have now quadrupled my strength, gained several kilos in muscle mass, and today I focus on building muscle, optimizing my diet, and living healthy. I am stronger, healthier, thinner, happier!