One of the major problems with stress is that it attacks the mind first, making sure that its ability to response to it is limited at best. Stress causes weakening of memory sometimes to a point when you start forgetting things, makes it extremely difficult to focus on anything and makes you question your motives and your will to stand up from bed every morning.
Even worse than that, stress gets also into our feelings. We can be overcome with any feeling ranging from anger and sadness to panic with no prior warning. This makes living and especially solving the problem you have extremely difficult as such mood changes make you extremely vulnerable and prevent you from handling many issues in your lives much harder.
When your mind gives up, the body will soon follow. Tightened muscles are the sign that your body does not relax properly and is in a state of a constant alert. This leads to weariness, digestive and sleeping problems, not to mention increased blood pressure.
If you start feeling weak and weary due to your stress-induced physical problems, this sooner or later will affect your social role and functions. You will become much worse employee as even the simplest tasks will prove to be beyond your abilities. You will start to shout or cry for little or no reason, keeping your family on tips of their toes. And such situation will only aggravate your initial mental stress problems. If such vicious circle has been started, you have to look for help and break it as soon as possible - the worst is still ahead of you.
If you do nothing to cope with stress and let it grow, after a few years you will notice that your physical and mental condition will have gone to pieces. Heart diseases, obesity, muscle problems, arthritis, depression all of those conditions are likely to show up if you don't stop your stress now. If you choose to do nothing, you risk death whether due to your medical condition or a suicide attempt out of depression. This is a "do or die situation".
The major problem with stress is that most people under stress try to solve their problems all by themselves, without any external support. They try and try, but most of them fail because of the stress they feel and the decreased ability to solve problems that is the primary mental stress result. Remember, there is no shame in asking for help. Even more, such call is a proof that you are still thinking clearly and do your best to solve your problems. If you try to do it alone, you will be pitied. If you ask for help, you will be revered. It's as simple as that.