When I went on it 19 years ago I had no problem and got it right away. I have been off it for many years now but since I have come out of remission and can't work again, I was told I didn't have enough "credit hours" to get back on it.

I don't think you should have a problem, hint here, get a copy of your medical file and a note from your Dr and send it in with the application as that will speed up the process.