Hi and welcome.
I'm also 57 and also gained a great deal of weight due to medication so I can totally relate. The medication I was on literally shut down my metabolism and when I finally stopped it, I did have to struggle for a bit to get my metabolism working again....but I persevered and it's finally paying off.
I'm only 5'4" and had never been that heavy, even pregnant....and boy, was it ever uncomfortable. I'd had no idea until I had to experience it for myself. I could hardly tie my own shoes....not pretty, that's for sure.
There is SO much great information on this site. I've been reading for a few hours almost every day and have learned so much. I also just joined a group here for over 50's..one of the support forums here, called "golden girls" and the women seem very friendly and supportive there. You can find it if you look under "support groups" on the main page of the forums here.
deena