First of all,
You have done a fantastic job on your weight! With all the stress in your life and jobs in an ice cream shop and now a waitress, it amazing that you haven't completely thrown in the towel. You have a great deal of determination and pluck and believe it or not, those will get you far in life. I'm sorry things didn't work out with that band. Maybe things will work out for you in some other musical venue, or maybe they won't but all successful people have several failures for each success. But it is the successful people who keep trying and find something that works out for them. It's the same thing with losing weight. I know your life is still stressful but maybe it will be stable enough for a while for you to spend some of your energy tackling your weight objectives.
I believe in you; I truly do. The stars may or may not align right for a musical career, but you will be a success.