Dr and the Drunk

A drunk goes to the doctor complaining of tiredness and headaches. ‘I feel tired all the time,’ he slurs, ‘My head hurts, I’ve got a sore bum, and I’m not sleeping. What is it doc?’
Frowning the doctor examines him thoroughly before standing back.
‘I can’t find anything wrong,’ he says.’It must be the drinking.’
‘Fair enough,’ replies the drunk.’I’ll come back when you’re sober.’