Immediately after: any post-loading supplements/vitamins/etc.
Then, smoke as much weed as it takes to get your appetite up, eat something nourishing (as much as you can shovel in). Drink lots of water and/or a hot beverage.
Take a hot shower.
At this point, you've replenished your body with much needed nutrients and fuel, you feel cleansed and reborn from the shower, and you're still a bit high from the weed.
Optional before sleeping: Xanax/a beer/opiates
Sleep.
Wake up, force yourself to get some exercise, shower, then eat. You'll feel like new again.