I Went To A Doctor For Cold Symptoms And Sore

I went to a doctor for cold symptoms and sore throat he said i sounded easy and said he'd give me a prescription. I showed him one I didn't use yet and he said to go ahead and take it. It is Biaxin. I took second dose this morning. Last night felt worst. I don't feel this is the right medicine. I do have Apo myinocycline for skin issues can i take that. and if so how soon?