HI, thanks for using healthcare magic Diabetic neuropathy is a complications of uncontrolled diabetes. It would normally occur after at least a few years of uncontrolled blood sugars. If this is the case for him then it could be the reason for his pain.There are other causes of neuralgia such as vitamin deficiency, side effect of medication, liver disease, electrolyte abnormality, alcoholism. Sleep apnoea would present with history of snoring, episodes of waking at night due to temporary inability to breath, day time drowsiness. It is more likely to occur in persons with excess weight. He can consider the emergency departments who may assess him for a minimal amount. I hope this helps