My 22 year old has been ill for a couple weeks. Nausea, chills, fever, loss of appetite. Negative strep throat, negative mono, some leukocytes in urine. Put her on Bactrim and some anti nausea pills that dissolve on the tongue. Couple days later we were in ER because she was having difficulty breathing and pain in the chest. Negative mono, no bacteria in urine (but she was on Bactrim), negative chest X-ray, and negative EKG. Thought it might have been a side effect of Bactrim, so switched her to Keflex. So a week later her fever and chills are gone, but the nausea is still present. She seems to have sensitivity to noise and isn t eating much (mostly because of the nausea). Had her take another anti nausea pill and now she s able to eat. Says she also feels a little anxious. Any thoughts?