Suggest Treatment For Headaches And Muscle Pain

i was given Nitrofurantoin mono mcr 100 mg. on 2/26/15. the results of a yrin sample came back 3/3/15 but i was not noyified. I started have headache shaking muscle pain on 3/2/15 . And it continurd to get worse and woke up today 3/6/15 with a very painfull achilles tendon. I went back to the dr and they said the unrie test came back more than 100,000 colonies of E Coli?ml of urin. and said that that strain my be Resistant to this Medication. they took Blood and more urine and said if i get worse over the weekend to go to the emergency room. Now I am having a fever up and down between 99.00 and 101.7