In my opinion, if you feel like you have lost grip and everything is going downhill ask for help from friends or relatives. In addition, evaluate what is causing it and focus on the things that are positive and important in your life.
Stay Positive. Everyone goes through hard times. The Best of us didn't become the best by being the best in one day. They all were put to the hardest of them all. YOU just happen to be somewhere where you are currently on your "not so good" place. This is just temporary. You can go stay down and be depressed or YOU GO CONQUER THE WORLD. and be yourseld at the same time. A true person's character is shown when he is down.
Remember: Diamonds are made thru molten rocks underneath the earth where they undergo the toughest, roughest, deadliest tests to become the hardest, most beautiful stones on Earth.