Sharon,
I relate to you in so many ways. Going from being a type A respected business professional to not leaving the house is where I'm at. When I do try to do something other than medical related appointments I pay for it the next day, because of my fibro.
I know you have been dealing with this almost your entire life. Keep looking and can you file for disability again? You are just one interview away from a job. Maybe you could also look for lower paying jobs that your last ones. I'm not talking about fast food or retail. Just something else you can do in your field - like starting over again but in the middle. I know many that are in the same boat as you are and personally I think they are being discriminated because of being middle aged.
I wouldn't have the energy to start my own business again and can't handle the stress but I wish I could get to feeling better so I could go back and get a less stressful job.
Where there's a will there is a way. Keep on being the beautiful dynamo you are.
Take care