Hello I Am A 65 Year Old Female And Just

Hello I am a 65 year old female and just had suppose to be legionella bacterial infection,then my doctor said it is flu.They gave me a very strong antibiotic for the bacterial infection. I took it for six day. It is 500mg tablet to be taken once a day.I read it is a very toxic drug for legionella infection. Now I havefever/ feeling feverish in the morning.My latest blood test is clear of the infection according to my doctor.I am still worried.Please help. Thanks