Unemployment will not only affect your health but your life entirely. When you are idle for a long time, craxy things start creating into your mind, you start engaging in worthless things just to fill up the vacancy. The worst is when depression sets in, it comes to destroy as you will see yourself having low yourself esteem and incapable of doing anything, by then happiness is far from you. You can't move on with your life, you cant get married or feed your family if you have one. The thoughts of death might accompany that. In every thing you do, try not to be unemployed.
However, so many can't overcome this situation at a particular period of their life, probably due to the situation of the country or their own shortcomings. This is why one have to work hard and hope for the best.