Hi Annie, I have not been in your specific situation, (I'm still trying to get to the point where I feel cute) but I do understand having a bad body image.
I just wanted to say that there is nothing wrong with wanting to dress cute at 51. How you feel in something is more important than whether or not it's "age appropriate". Unless we are talking about tiny leather skirts and 5 inch heel boots LOL.
I'm looking at your profile picture, and you are super cute, and going through menopause isn't going to change that. I'm not sure how long you've been maintaining in the 150 range, but maybe it's time to start working at it again. Maybe not feeling like you really reached goal is affecting you somehow?
Have you considered doing some weight training? It can really change your body and help with the way clothes fit.
But in the end don't forget that you're awesome, you've lost 35 pounds!! Be proud of yourself.