This happened to a friend of mine when she was even younger than you. It turned out she had anemia. She got treated for that and her hair stopped falling. So I suggest you go to a doctor and run some tests to understand what is causing this.
If you're male I suggest taking one or two capsules of Saw Palmetto daily. Male balding is often caused by over production of dihydrotestosterone and Saw Palmetto helps. I'm the eldest of three brothers and have been using this for 25 years. They're both bald and I'm not even greying at 59.