The Veteran's claims for service connection for drowsiness, dizziness, fatigue, and nasal congestion are being remanded due to the need for clarification regarding their etiology. The VA will conduct further examinations and review the evidence before making a decision.

The Board has determined that the AOJ did not obtain all necessary opinions regarding whether the Veteran's symptoms are related to an undiagnosed illness or medically unexplained chronic multisymptom illness (MUCMI). The claims for service connection for fatigue, fibromyalgia, left elbow disorder, right elbow disorder, and sleep disorder are remanded for further development.

The Board has found that additional VA opinions are needed to address the nature and etiology of the Veteran's dizziness, including benign paroxysmal positional vertigo, and tension headaches, including migraines. The opinions should consider the Veteran's participation in a TERA and the combined effect of all his service-connected disabilities.

The Veteran's dizziness condition is rated at a 10 percent disability rating under Diagnostic Code 6204, as the evidence does not show occasional staggering. The Board finds that a higher rating is not warranted.

The Veteran's claim for service connection for migraine headaches, as secondary to tinnitus, is granted. The claims for service connection for hearing loss disability and a disability manifested by shortness of breath other than chronic sinusitis and allergic rhinitis are denied. The claims for service connection for an intestinal disability (diverticulitis), fatigue, hypertension, neck disability, right upper extremity radiculopathy, left upper extremity radiculopathy, right shoulder disability, left shoulder disability, upper and lower back disability, right lower extremity radiculopathy, left lower extremity radiculopathy, right hip disability, left hip disability, right foot pain, left foot pain, gastroesophageal reflux disease (GERD), and an acquired psychiatric disorder are all denied.