Start calling some of those law firms that advertize on TV and on the Net - the big nationwide firms that just do disability. You'll probably get a return call from a paralegal who'll give you excellent feedback on your chances. Call several. It doesn't cost anything, and they will be glad to hear from you.

It is a lot harder at age 45 than at age 55. Getting fired from jobs will help you better than you quitting. Be careful about you "throwing in the towel" on your employment. SSA would be much more impressed if your employer had to call men in white coats to drag you out if there. They want to see evidence of failure on the job.