back, head and shoulder pain can all be symptoms of the TMJ. We're all connected from head to to and if one is out of line, they all go out! I know how that feels.
TMJ can happen for a lot of reason, but if your teeth are very crooked or the don't fit straight, it puts a lot of pressure on the jaw. It can happen if you've had an accident too, or from stress, or grinding at night. Uneven teeth can touch and make it very sore. TMJ is also a type of nerve pain, so there may be something related with your teeth.
Have you seen a dentist about this pain? if you have not, please do!!! Let them know what you've been feeling. They can find out if there are any TMJ specialists near you. Most regular doctors don't know how to treat dental problems well and will give you pills. Reducing pain is necessary but to elliminate the problem you need to find the source of the problem!!!
your pain might get better when you have something in your mouth, because to hold something in your mouth, you must close your jaw a little bit, and that may take pressure off of the problem spot.
Do an online search to reduce TJM symtoms. The main things are things we can try and do everyday. sleep well, exercise daily, dont chew hard or chewy things, heat/ice, antiinflammatories, gentle jaw exercises, stretching from jaw to neck to upper body. If you can make your whole body well, your jaw will feel better too, so work on the things you have control over!
If your teeth are causing pressure, a lot of times they can fix it by normal dental procedures. they may offer you to wear a splint at night to prevent grinding/pressure.
good luck my dear! please try eveything you can... oh and massage, its great!!! pills get you to the point where you can go on with your day, but without fixing the issue, it wont get better!
TMJ symptoms can mimic or feel like the pain is coming from your teeth. I have seen many people have multiple root canals by doctors that do not know much about TMJ. Have an evaluation as dana007 states by a TMJ specialist to understand what is going wrong. Good luck and much healing to you.