I went through this too. It is a powerful transition in a womans life. Your hubby is absolutely correct. You and he need to re-connect and find things you enjoy doing together. I would also suggest that you cultivate interest in something you enjoy doing, just for you. Really the only thing that helped me was throwing myself into something, for me it was quilting and growing cooking herbs (parsley, basil, dill, etc) Due to the age of your child, I am sure you are concerned for her wellbeing, maybe more so than if she were a little older and better equipped to take care of herself. Teenage years can be trying. What I learned is that you cannot shield them from harms way forever. You have to let them make mistakes and hope the good seeds you planted in their heads when they were younger, will get them through.
The feelings you are having are very normal.
Take a deep breath, it will be OK. This is your time, now what do you want to do with it? I think this can be a very satisfying time of life, it all depends on how you approach it and what you do with the opportunities at hand.
Good vibes being sent your way.