I was prescribed metoprolol a week ago by my new cardiologist. He switched me from lisinopril 10 mg. Once a day to 25 mg.metoprolol twice a day. I have been experiencing some chest pain off and on, and off and on pain in my back between mt shoulder blades. I did not have these pains until I started the metoprolol. Are these side effects that will go away with time? Or should I return to using Lisinopril?