Hi there
I came across your diary and thought I would come check things out and see how you are doing with your goals.
I have been a member here for about 2 years, in the first year I went from 171.4 pounds to 122.4 pounds and then kinda dropped off the forum for the last year. But, I do understand how scary any journey can be, especially a weight loss journey.
You talk about concern regarding calories. I will share some insight that I gained while I was actively losing weight...
Don't cut your calories too low. This is probably the biggest mistake dieters make when trying to lose weight. I was eating about 1,200 calories a day and doing intense exercise for about 60-90 mins a day and I would only lose like 0.2 pounds, and I just couldn't understand it! Turns out my body was holding onto my fat for dear life because I was starving it, I upped my calories to 1,500-1,800 a day and suddenly I would lose like 3-5 pounds a week... give your body what it needs, but not in excess!
Also, I don't suggest depriving yourself from foods you like. If you do you fall into the "all or nothing" mentality, which I had trouble with. I would slip and eat a piece of cake and then I figured that since I messed up there was no point in eating healthy the rest of the day or working out... If you want a piece of chocolate eat ONE piece of chocolate, if you want some ice cream eat ONE SERVING of ice cream... weigh it too, but don't deprive yourself. I would say this is the major reason people binge and go over board on eating, they tell themselves they can't have it so they crave it even more than if they had not put the restriction on themselves.
If you are eating lean meats, whole grains, fiber, complex carbs, and good fats then you will feel fuller longer, and your blood sugar will stabilize and you will have less cravings and hunger pangs throughout the day. If you are following that type of diet then you can eat whenever you are hungry and can lose weight without counting calories. This is from the South Beach Diet, which you don't have to follow, but it worked really well for me. It allows you to eat until you are SATISFIED, but requires you to stop before you are overly full or stuffed.
Eat every few hours, eating 6 meals a day will give you the benefit of avoiding a binge at the end of the day. Some experts suggest eating protein every 4 hours, be it a low fat yogurt or string cheese. This will keep your body from eating away at your lean muscle and use fat for energy instead.
Drink plenty of water! Water helps the liver and the rest of your organs effectively use fat, and it will help your metabolism speed up. Don't skimp on 64+oz of water per day. When I was working out at high intensity I would drink about 3L of water per day.
Last is don't skimp on breakfast! It really is the most important meal of the day. It is known that eating breakfast wakes up your metabolism for the day and keeps you from over indulging throughout the day. People who eat breakfast tend to lose more weight than those who don't eat breakfast.

If you have any questions please feel free to message me or post it in my diary! Great work on all you have accomplished so far. Just know that you CAN and WILL get to where you want to be!