Last Year I Lost 17 Lbs (mostly Fat Too). I

Last year I lost 17 Lbs (mostly fat too). I have never lost this much weight at one time (and have successfully kept most of it off for the past 10 months). I Look and feel the best that I can remember. I'm 54 yrs old. My problem is, I'm so afraid that I'm going to be one of those people that not only gain all that weight back, but even more, because I was never a "sugar-a-holic" nor did I binge eat, but over the past couple months things have changed like I can eat a large meal but not feel full, So I obviously eat more often too, but also, I am constantly craving "sugary" foods, and find myself eating full containers of cake frosting over the course of 2 days, or I will even eat an entire pack of raw cookie dough (would be 12 cookies) in 1-1/2 days. Nothing has really changed in my life differently that could be the culprit for triggering this insatiable binge eating & cravings either. So far I have only gained 3 lbs over 2 months, (which is amazing for how much I have ate, especially with sugar), so I'm just wondering if this is a delayed side affect from when I used Phentamine & Lipo Injections (I was in a weight loss study under the care of a doctor for a 6 week period during my 17 lb weight loss), or is it just a psychological issue that I should seek counseling for? I loved how easy it was for me to loose weight with these products, and can honestly say, while I was in the program and 8 months later, I had no desire to binge eat, nor did I crave sugar. This is a new development with me?
Thank you for any advice and/or recommendation you can provide me.