I would just let them know that you were having some medical issues that prevented you from working (not entirely true, but it would work). I know someone who didn't have a job for many years either and ended up getting a job. You just have to make them feel like you are ready to work by saying you had some past issues, but now you are ok and ready to work again. I took a resume class before and they taught us things like this. If you really can't do it, then I understand, cause working even from home is hard for me sometimes (I am unmedicated), but just wanted to give you some hope and let you know you can do it.