Biaxin and upper respitory infection

i'm taking biaxin for an upper respitory infection. I have cramps, dihherra, sad, funny taste in my mouth but now that i've been taking it for 3 days i've developed a bad rash on my thighs, buttocks, legs on my knees and behind my knees as well i also have it on my arms. The rash is red with small and large bumps is this a side effect cause it's the only thing i've taken or done differently. PLEASE ANSWER

After almost 3 days of taking Biaxin for an upper respitory infection, ended up with a bladder infection with a lot of blood in the urine and painful bladder spasms. I had a bladder infection after finishing a course of Biaxin over a year ago. Previously I only ever had a bladder infection once 25 years ago. This seems like more than a coincidence.