How do you deal with questioning yourself?

Hey guys so I lost another disability appeal. The judge says I can work and do things like kneeling and reaching all day. Even though I have hurt my shoulder (Hyper mobile EDS) just reaching to get something out of the pantry. I am questioning myself in the aspect of What if I just tried to push through the pain? Could I do it if I just put my mind to it? Is this just me being lazy like my sister says?

I am sure that any person who has a health issue has had these thoughts. I am just wondering how others deal with it. I think the mental part of having a physical aliment is overlooked quite a bit by other people.