“Inside every anxiety lies the seed of equivalent benefit.” – keep your mind cool and some of this are planned, you might miss the opportunities if you focus wrongly.
Moving to a new job, or taking a test. This feeling can be quite nervous, but also it may also drive to to be better, working harder, doing a better job. Take a moment to adapt to that situation, you probably not sure sure how to go about it. If you re-look at the quote above, looking at it in a positive attitude, it's sure that you will get by it well, but not prophesying on the negative outcome.
Solutions-
When things didn't work out the way it should be, keep calm focus, and will will soon understand that situation, things happen for a reason.
This mode will let you sink into a stage where you might feel very lousy and have to find a way to address it. Find the cause to it, not to avoid it but how to improve on it.
Example: I find the “To Do List” quite irritating as we don’t have to resources or time to accomplish it, it’s always something stuck “uncomplete jobs”. I put it as “Extra or Improvement”, “additional works” in my mind I have program it as “good to have” but not necessarily done right away. This way it removes something on my mind.