Hi
Welcome to the MedHelp forum!
What you have is probably Scalene Myofascial Pain Syndrome. When scalene muscle is the cause of pain, the pain is referred to chest, inner lining of scapula (shoulder bone), shoulder, posterior and lateral sides of the arm right up to the thumb and index finger. When this muscle shortens, this can press on brachial plexus (bundle of nerves and blood vessels in the armpit) and the subclavian artery and can compress or irritate these structures and cause symptoms such as abnormal sensation, cold extremity, claudication, and lymphedema (swelling of lymph channels) in the involved extremity. This is a major cause of TOS or thoracic outlet syndrome. This needs to be looked for. Also possibility of persisting poor supply to bone should be checked. Take another opinion from a trauma specialist, a chest specialist and an orthopedic specialist. Take care!
Without a thorough health history, it's hard to even begin to guess what is causing your pain.
Have you been thoroughly tested for Periphernal Nerve disorgers and Central Nerve Disorders? Multiple Sclerosis comes to mind, but I'm not entirely familiar with the disorder. What I do know about it, it doesn't seem this falls in line with the symptoms. Have you had your back checked? A pinched nerve could do something like this, do you have a slipped disc?
If you had undiagnosed fractures and neither were receiving blood or oxygen for a long period of time, you could have a bone infection or bone necrosis. That really shouldn't be difficult to diagnose though.
You say your pain is increasing at night? Is it increased when you're horizontal? Like when you lay down? Or is it more painful after a full day of using your arm? (Compare it... when you lay down to take a nap, does it hurt like when you lay down at night?).
What kind of pain are you trying to describe? Is it a deep ache? Throb? You describe it radiating when pressure is applied... is it sharp? Hot? Shooting? Stabbing? Being able to describe the pain with these kind of terms will help your doctor figure out what is actually causing it.
For instance, a friend was stabbed a long time ago, and has nerve pain because of it. I always though it was a "stabbing" pain, but it was later described to me as being more like a sensation of electricity in the skin. Constant and so bad that feeling air moving across the skin brought my friend to their knees.
Do you have any numbness or tingling in your hands or feet? And doll, do me a favor and make sure you're not doing something with your arm that might be exacerbating pain. Like using it to lever yourself out of bed in the morning, or shutting a door without using your hand. It's amazing how many times I've bruised or hurt myself and not even realized it until I caught myself doing something like kicking the door shut and going "OH, so THAT'S why my toe hurts!"
Tracking what you do in a day, and how it affects you and your pain, may help you identify if there is a particular motion or action that causes it to get worse. Good luck, and please keep us posted!