Sorry you're having such a tough time right now but meowee is right - this is a great place to start. There is a whole forum just for us 50 somethings (I'm 51 too, well, closer to 52 than 51 but who's counting right?

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First thing you really need to do is decide what you hate more - measuring your portions or being overweight. Then, take all the stuff you think you know about "diets" and toss them right out the window. I thought I was quite the expert dieter since I've been doing it all my life (sometimes with great success at losing but never maintaining, hence the screen name

) Give yourself a little time to come up with a plan that will work for you. 3FC is chock full of great ideas. Some people are following structured diets like Atkins or South Beach and others (like me) took a little basic information from a bunch of different ones and came up with our own plans. It won't happen overnight, and it takes work but it really can be done.
Come to 3FC as often as you can. I wouldn't have made it this far if it weren't for the friends I've made here.