I totally agree with the above.
Generally there is one large issue that tends to make all the small issues seem like a big deal. When that happens people tend to work on the small superficial issues.
Focus on what you can control.
Work on what the real big issue is. Once you have addressed that the small issues go away.
Also keep in mind a negative disposition will attract other negative people and the feeling you are experiencing will spiral out of control.
Any problem you are having is really an opportunity. You have the ability to overcome anything. Impress yourself by taking control and using the opportunity to grow.
Doing so will give you more confidence and a better outlook.
Enjoy each day for what it allows you to do. You never know when it could all come to an end!
Best of luck