tendinitis of my shoulder, elbow, knee, and hips.

i was diagnosed in 2009, after a mild car accident. i had minor injuries, but for some reason the pain just kept getting worse. for a while they didnt know what was wrong and would say it was in my head. i swore up and down it was not in my head and eventually had to quit my job because i could not deal with the pain. My job was an EMT and lifting heavy patients and stretchers was in my duties so it was excruciating!! i have not been able work since than due to this horrible burning pain in my back. lately ive been waking up with such severe swelling that i can not move or bend my fingers and knee. i recently enrolled back in school and am doing very well but fear that come time to acctually work i will not be able to do it. i have been denied social security and am upset becuase i dont know what else to do!