Muscles sorness, dizzy, tired all the time, HELP PLEASE!?

I am 17. I work at Sonic, skating to customers. I feel about a years ago on my tailbone and dislocated it. I have been doing physical therapy to relocate my tailbone and after therapy I am sore, but it usually lasts only 1-2 days. Ever since my fall I have been to many doctors for my joint pain in my knees, elbows and hips. They sugested arthritis.But, Over a week ago I woke up and could barley move because my muscles were stiff. Still now I am very dizzy, I have ZERO energy and my muscles (all over my body) are very sore. my physical therapist discharged me because she feels my problems are no longer needing therapy and need attention from my pediatrician. I got blood work done yesterday. I was just wondering if any of you knew whats wrong. Feel free to ask more questions, PLEASE HELP!