Dear friend, welcome to HCM.
you should recheck with the traeting doctor, because you have fever
and also beacuse fleas can transmit many diseases not treatable with bactrim
please consider doxycycline 100 mg twice a day to cover these other bugs like rickettsiae, which could get serious. the tests are not much reliable for these and get positive late after 2nd week when damage is already done.
also consider blood tests under guidance.
I hope to have answered your query satisfactorily.
Take care and please keep me informed of your progress.
Good Luck !
May I request you to rate your experience here before you close.