If you are that concerned, the ER or a doctor's office is where you should be. Not the internet.
There are SOOOO many reasons for pain, you need a live human to look at you.
I had 6x bypass surgery 15 years ago and I wake up with all kinds of different pains in my chest, none of which are related to my heart.
I cut some brush yesterday --- muscle pain.
I helped a friend push his car --- muscle pain.
I worked on my car yesterday --- leaned against the fender and created a sore spot.
It's raining today --- lower barometric pressure causes the healed sternum to hurt.
Stopped raining --- barometric pressure going up causes it to hurt.
Slept on one side most of the night --- rib cage stretching back into normal shape pulls on the wires they laced it up with, makes it hurt.
Ate some fried food yesterday --- acid reflux.
So if you're really worried --- SEE A DOCTOR!!!!