diabetes, PTSD is an unstable condition that may not manifest itself until well after the stressful event which caused it, and may wax and wane after manifestation. E.g., Hamilton v. Derwinski, 2 Vet.App. 671, 672, 674 (1992) (remanding for further PTSD findings in a case like Jones’s where evaluation at discharge from military service revealed no psychiatric distress or disorder) (subsequent history omitted). Retrospective medical diagnoses constitute relevant evidence of pre-expiration disability. See, e.g., Trenary v. Bowen, 898 F.2d 1361, 1364 (8th Cir.1990) (magistrate judge and ALJ accepted retrospective diagnosis of depression); Basinger, 725 F.2d at 1169; Parsons v. Heckler, 739 F.2d 1334, 1340 (8th Cir.1984); see also Richardson v. Heckler, 750 F.2d 506, 509 (6th Cir.1984) (<HOLDING>). Where the impairment onset date is critical,
holding that the alj erred in determining that the claimant was disabled when a retrospective diagnosis along with all other medical evidence supported a finding of disability holding that district court erred in failing to consider evidence of secondary considerations holding that the alj erred by failing to mention the contrary opinion of a treating physician holding that the alj erred in failing to give the findings and assessments of the treating physicians any weight when the medical evidence and claimants testimony supported a diagnosis of cfs holding in a similar case that alj erred in failing to consider retrospective diagnosis indicating that ptsd existed from time of discharge from army