Some help with a medical problem?

My little sis is so sick. She's 17 and has had a fever since monday. Her legs hurt so bad and feet are numb. She's throwing up and can barely walk. The e.r. said the bloodwork is fine. But she is still in so much pain and is starting to lose hearing. She had a baby on march 19th. She is also a little anemic. Any ideas on what could be wrong would be most helpful. Thanks.Some help with a medical problem?
well not sure pray & if at all possible someone in family check out Omnitrition-she needs to be healthy for that baby & herself too so nutritional products wouldn't hurt-talk to your folks into at least looking with an open mind not trying to force just suggest so if you think it is a valid answer to your question then do as u feel but think positive she needs you to do so
I wish you all the luck
Get a second opionion or a second ER. You have to PUSH those people sometimes into doing anything for you. It's sad but true, you have to take it into your own hands. Go back and don't leave til she has a diagnosis.
Like WinterBorn said, get a second opinion. Does she have a regular doctor that she see. Sometimes you do have to push for a diagnosis and sometimes it takes finding the right physician who is able to make a correct diagnosis. Good luck.