Now, these things aren't diseases in the modern definition, and it's dangerous to classify them as such, because of how humans have treated eachother when mental disorders and the like are defined as diseases, curses, or the like, but I think there's a decent argument that since we know that mental health is physical health, meaning a mental disorder is a physical disorder whose symptoms effect the operation of the mind, and since some mental health issues can be gained due to environmental and experiential factors, such as Borderline Personality Disorder and PTSD, we can conclude that Lay On Hands should be capable of genuinely curing these disorders.
Or, would you argue that it can't even cure chronic diseases that are unambiguously physical?