3) Scheduling your activities for your first week
As we're talking about a smooth adaptation for your 1st post-vacation week, think twice about your activities. Don't get too much on your plate. Make sure you're taking it piece-by-piece. You definitely don't want to stay overtime right away and start feeling a slave to your job.
Make sure you have enough time to talk to your friends at work and regain that social power. What's even more important here is that it's vital that you learn about all the updates at work that happened in your absence.
5) After the working hours
Schedule some fun for your after-work hours. Go to the cinema, play bowling or hang out with your family and friends. Your purpose is to have some bright moments. This way, your brain won't perceive your job as an enemy. And won't feel like your doing that dreading work. As a result, that 'I don't wanna go to work today' feeling should fade away and you'll get back to normal life.
Remember, we start feeling depressed when our brain says, `Hey man, what you're doing is wrong. What you're doing won't make you happier`. That's why the only way to avoid feeling depressed is to convince your organism and brain that your job is your friend, not an enemy.