is no rigid requirement that the ALJ specifically refer to every piece of evidence in [its] decision, so long as the ALJ’s decision” enables us “to conclude that [the ALJ] considered [the claimant’s] medical condition as a whole.” Dyer v. Barnhart, 395 F.3d 1206, 1211 (11th Cir.2005) (quotation omitted). Moreover, although the ALJ has a duty to develop a full and fair record, there must be a showing of prejudice before we will remand for further development of the record. Brown, 44 F.3d at 935. Here, Robinson, who was represented at the hearing before the ALJ, did not allege that she was disabled due to CFS either when she filed her claim or at her May 2006 hearing. Consequently, the ALJ had no duty to consider Robinson’s CFS diagnosis. Pena v. Chater, 76 F.3d 906, 909 (8th Cir.1996) (<HOLDING>). Nevertheless, al though the ALJ did not
holding that an employee who claims to have been terminated by her employer for having exercised her right to disability benefits raised a cognizable claim under  510 of erisa notwithstanding the fact that she received the benefits from her employer prior to termination holding that disability benefits are not retirementtype benefits holding that a claimants failure to list an impairment either in her application for disability benefits or through her testimony disposes of the claim because the alj was under no obligation to investigate a claim not presented at the time of the application for benefits and not offered at the hearing as a basis for disability recognizing that the alj has an obligation to investigate a claim not presented in the application for benefits when testimony at the hearing places him on notice of the need for further inquiry recognizing receipt of unemployment benefits could impact a claimants disability claim