How Can Nausea, Vomiting, Body Pain, Headache And Fatigue Be Treated?

My 19 year old daughter has been sick for 2 weeks with nausea, vomiting, body aches, headaches and fatigue. She went to the ER on Sunday and they hydrated her and helped with the nausea, did a chest x-ray, blood and urine tests. Also a flu swab that came out negative. She is still very sick and not able to eat much. Also her insurance (Medi-Cal) ended and she now has no insurance. What should we do?