urinary tract infection
"Today was the first day I took this medication. Two hours after, I experienced joint pain, blurred vision, back pain, a headache, chills, fever, nausea, cough and sore throat. 

This was in addition to my already severe urinary tract infection symptoms which I was sent to the ER for the night before, including, severe pain in pelvis, achy back (kidneys). 

Although, symptoms of a severe UTI can also be fever, pain in the flank (pain that runs along the back at about waist level), chills, and nausea, I believe the medication gave me the additional symptoms. I was fine all day long until around two hours after taking the pill. After about 3 hours, symptoms increasingly went away. I am not sure if the pills are working or if they wore off."