Hi Michelle,
At 5'10 I think 160-180 is a healthy weight. I'm glad to hear you say that. I am also 5'10" and when I got down to 150, people would tell me I was to thin, but I didn't listen, I had this image in my head that everyone had to weigh 130.... OY VEY. Now over 200 lbs, I could kick myself.
Have you spoken to your doctor about how you are feeling? That would be my first suggestion. Maybe he can help you with your anxiety.
As far as dieting, well as you probably know, one size does not fit all. So maybe you could start out counting calories, we have a calorie counting board, we also have weight watchers, south beach, etc. So that would be something you would need to experiment with.... see what works for you. I have to say that the ladies on this board excellent and always willing to help out when they can.
Good luck
Leenie