New jobs can be very daunting for introverts. The job hunting process alone is miserable. Interviews are like first dates! Yuck! But also once you've gotten the job, adjusting yourself to the new routine, the new energy flow, are all things that take time and it's important that you allow yourself that time.
It's also important for those sensitive introverts to be careful what they are feeding themselves in terms of entertainment! I have been working really hard via all the streaming options to catch up on shows that I always wanted to watch but never did. And the show I was catching up on during this time of new-job-transition was Alias. A wonderfully written and dynamically performed show but it was too dark for this transitional time! Now that I'm watching Sabrina the Teenage Witch my transitioning is going much smoother. So think in terms of how you react to different genre when you are relaxing at night and allowing your energy to calm to it's usual pattern. It may just be television/movie/book/music but entertainment is escapism. And when you are escaping from a challenging time during the day be mindful of what you are escaping to! These things effect your energy, this is why we like them! But it is not always something we are consciously deciding.
Be mindful of the environment you choose for yourself, especially during these transitional times.