Im having back pain, as well as extreme fatigue. i've been overly weak and loss of appetite. im only 22, but feel like i can't barely move?

See a doctor: It is difficult to make a proper diagnosis since I am not there to see the condition. I recommend seeing a doctor so that they can make a proper diagnosis and give you something to get rid of the condition or relieve symptoms.

See your Doc ASAP: You need exam and evalutation with lab tests as needed. These symptoms could be due to a number of things, for example, anemia, thyroid disease, adrenal insuffiency or rheumatologic disease.