 Clemons v. Shinseki, 00 Vet. App. 0, 0 (0000) ("It is generally the province of medical professionals to diagnose or label a mental condition, not the claimant"); Woehlaert v. Nicholson, 00 Vet. App. 000, 000 (0000) (unlike varicose veins or a dislocated shoulder, rheumatic fever is not a condition capable of lay diagnosis); Jandreau, 000 F.0d at 0000