First of all, he needs some serious Vitamin B (might as well increase his other vitamins as well). His whole body is in upheaval and he needs help while it gets back to normal. The B vitamins will help with his energy and depression. Next he needs to start an exercise program (yes, once he gets the vitamins he'll feel like doing somthing). A walk will do for starts. Get out in the sunshine and WALK.
He's a Freeper, he's loved, he will now be prayed for.