Sarah, sorry that the pain is getting worse. If you get a chance try to find a picture of the muscles in the body. I think that you will be surprised to see where some of the muscles in your chest and back originate and insert. We have muscles that are postural muscles. These muscles often "wrap" around the body. They will start in the back and end attached to the ribs. These are what help us to stand upright and be able to bend over and stand back up. Check it out. It has helped me to visualize where my pain is and what muscle group I need to either stretch and exercise or put heat on and relax. It helps you to localize the pain a little better. For example, when I feel a pain in my sternum, I often find that the actual tense muscle is behind my scapula. If my hubby massages the area kind of behind the scapula I can get a little relief from the chest pain. Another example, is this pain that I get going down the back of my leg. It is not my leg that is sore but the sciatic nerve getting set off by one of my glute muscles. If I massage the glute the pain gets a little better for a while until I can get off my feet.
Don't know if this helps but it is worth a shot.
You are in my thoughts.
Worry not for tomorrow, for tomorrow will take care of itself.
Remember healing comes one step at a time, sometimes it seems that its one forward and 2 back but ultimately, always in a forward direction!!!