Toller,

A midlife crisis is experienced between the ages of 40 and 60. It was first identified by the psychologist Carl Jung and is a normal part of the maturing process. Most people will experience some form of emotional transition during that time of life. A transition that might cause you to take stock in where you are in life and make some needed adjustments to the way you live your life. Most seem to come through the process smoothly without making major life changes.

For some, a midlife crisis is more complicated. It can be an uncomfortable time emotionally which can lead to depression and the need for psychotherapy. Those who have a hard time with this transitional stage might experience a range of feelings such as:
Unhappiness with life and the lifestyle that may have provided them with happiness for many years.
Boredom with people and things that may have been of interest to them before.
Feeling a need for adventure and change.
Questioning the choices, they have made in their lives and the validity of decisions they made years before.
Confusion about who they are and where they are going.
Anger at their spouse and blame for feeling tied down.
Unable to make decisions about where they want to go with their life.
Doubt that they ever loved their spouse and resentment over the marriage.
A desire for a new and passionate, intimate relationship.

Cathy Meyer about.com Guide

You may be having a mid life crisis but the anxiety may be a different issue. I know from personal experience that anxiety can wear you down a lot. Restlessness and uneasines are all signs of anxiety. I would highly suggest that you seek help from a psychologists of psychiatrist. A psychiartrist can prescribe medication that will help you feel better and also may help you through your possible mid life crisis. You may also may want to seek psychotherapy which can also help immensely. Talking things through helped me and it can help you as well.

Best of Luck,

Crazyman28