I'm on 100% permanent Disability since 2002. I did, however, get a small volunteer job recently. After 15 years out of work, it kind of feels good to be doing something, though it is hardly anything. So maybe doing something that you like on a volunteer basis might be a kind of middle of the road way to deal with this? You could explain to them that you are disabled and might not always be able to come to work, but that you will try your best to be there as often as you can. They should understand that. They, I would think, would be glad for what you can do. You would not need to describe your disabilities either. Just saying you are disabled or on disability is all that would be required.