What the hell is wrong with me? 10 points?

This is a tough one but I will give it a try. If you don't have any pain, popping, clicking, grinding, stiffness and limited movement of your jaw along with all the other symptoms then it is unlikely to be a sole TMJ problem. Your tmjs could be sore from grinding due to stress, Headaches in the temple areas along with muscle pain in your masseter, temporalis, and other muscles that move your jaw can be related to TMD (temperomandibular disorder). You may also have some form of migraine headache disorder and that can cause tmj pain as well. The main symptoms that you talk about are dizziness, lightheadedness, and now headaches, trouble sleeping and sore neck/back/shoulder muscles. This could be neurological, have your doctors performed a CT or MRI to rule out any brain tumors or tumors along your cranial/spinal nerves? I think you likely have more than one problem but if TMD is one of them then you should have a dentist check your bite to make sure it is normal and talk to them about whether a mouthguard can help. Some types of mouthguards can treat some types of migraines. There is one in particular called the NTI-TSS. Go to www.headacheprevention.com to learn more about it. Good Luck