It's summer time, so I sleep with my fan on and my door closed. This morning I woke up with a pounding headache and it feels as if my chest is very tight, right down the center. It's not focused on my left side, or my right side but it's directly in the middle and something as simple as making a quick movement causes it to flare up some more. It has happened once before and a co-worker of mine said it was probably a muscle pull, I work out every day and I do proper stretches, and it just happened over night. What do you think it could be?