bacterial infection
"Had flu, some fever and suspected pneumonia. Was put on Doxycycline 200mg to be reduced to 100mg next day. Wasn't eating due to loss of appetite - doctor said this medication would help. Instead, made me vomit about 30 minutes after taking it and made me feel worse. Eventually went to the ER and was put on Zofran and Prednisolone - a much better combination for what I was experiencing."