I'm 23 years old and i had a knee replacement in Jan. Ever since then, i have been sick with loss of appetite, weight loss, headaches, fatigue, feeling weak, and tachycardia. I've seen Doctors from NY to PA and no one has a clue why. The only thing that has me puzzled is my LFT was slightly elevated and no Dr has taken that to account. My right side does not hurt and not enlarged according to doctor's physical exams.