I recently developed what I believe is an intercostal muscle strain in my right side. It happened after a golf swing and was initially mild. After lifting something heavy there was a dramatic increase in pain after which seemed to exacerbate the injury. This happened about a week ago and now I've developed some moderate headpain which seems to only be on the right side of my head (same side as the rib muscle strain), mostly behind my eye and around the temple/ear area.

Is it possible the these are related? If not, what is the most likely cause of the headpain?