Hello, I have been experiencing some dry cough for about four to six weeks. I have no sputum with the cough, its more or so a dry cough. I have this happen several times a day. Recently, I also had an episode in which my lower left arm became heavy and numb. Then, the following day, I had extreme back pain on my upper back on the left side. I am becoming more concerned with my cough, and with the whole numbing and pain, feel very concerned.