Now I'll be working until I'm 75 and living in the ghetto.
No, you won't. You WILL have to take control of your financial future. Your attorney can give you an idea of what you will likely get in a divorce. If a reasonable lump sum is an option, I'd consider taking it - if not, make sure you get a life insurance policy on him in case he dies and you stop getting alimony and child support.
Some good resources on thinking creatively about your finances: Your Money or Your Life - great book by Dominguez and Robin Mr Money Mustache - great frugality blog, go on the forums and make a case study when you're ready and people can help you slash your expenses.
Don't fall into the trap of thinking you can't live well as a single woman. You have skills and a job, you're better off than many, you WILL be able to make a bright future for yourself.
