As lnog as you know he doesn't need anything, I think it is really is just a matter of sticking it out. Humphrey's now 6 months and is quite happy to be left when we go out for a couple of hours, (although he'll stand and wine outside the toilet door if I'm in there!). Its a bit like when children start school - they'll wail and cry and the minute you're out of the school gates they're fine. I always leave an old T shirt of mine, leave the radio on, make sure he's been for a pee beforehand and has a drink and a safe toy. A Kong, filled with a bit of sausage or soft cheese might help. Humphrey gets his everynight as a bedtime treat - its become his ritual and he knows its lights out, we go upstairs and he stays in the kitchen. best of luck!