For calorie counting I find it easiest to record calories at My Fitness Pal since it has a really good database of foods already in it.
For the bigger picture, did you ask your doctor for a diet? Did you want a 1200 calorie diet? That seems really low when you have a lot to lose. Is this a doctor who specializes in weight loss? If not, well, not every doctor knows that much about weight loss management.
I personally do count calories, but I also attend Weight Watchers. I know that is what works best for me. But, calorie counting doesn't work for everyone. Also, some people do better with group support and accountability (which is why I do WW).
I am just concerned from your post that maybe you were just given a diet without someone being thoughtful about what is right for you.