I am only 20 years old, and i am exhausted all the time. also have constant headaches and swollen lymph nodes in numerous areas. exercise and eating healthier hasnt helped.

Get checked: Your symptoms could be part of a bigger issue that could explain everything. You should be seen by a doctor for a complete history and physical - and probably blood work. Don't delay!

Need evaluation: If you have been experiencing this for some time , you need to see a physician & get evaluated including blood work. Detailed history of your symptoms is very critical .