Biaxin and prednisone

Have pneumonia currently and given generic Biaxin for 10 days. I am only on the second day, but I do currently have a headache (rarely ever get headaches normally). Also, this taste in my mouth is awful, but I can tolerate that alright. I do already feel a measurable difference in the infection in my lungs already so that is good. I am not depressed or anything else (yet). I had a nightmare about an oversize centipede on my bedroom wall. I was convinced it was there. I turned the light on, looking for this thing that in reality, was not there at all. My stomach is fine as I take 4 or 5 probiotics every time I have take a Biaxin tablet. I am also on Prednisone.