I've been having sharp pain on the left side of the back of my head. They last 10seconds but keep occurring over & over. If have taken IB & excederin. It takes a lot of them away but never eliminated. I take the pills every 4 hours but long before that time passes, they return in force. I got a bad hacking chest cough on Friday and then this started on Friday. Also, I was on a cruise at the time to the western Caribbean. Any suggestions to stop this pain?