Hi, Thank you for your question. Pain at only one side of the head and associated symptoms like orbital pain (eye pain) could be most likely suggestive of facial migraine. One may experience throbbing headaches and could be worsened by normal physical activity. Other symptoms may be nausea, vomiting and facial pain. A doctor can diagnose the migraine after understanding symptoms and examining you. Sometimes it is difficult to treat the migraine by just medications or combination of medications. Avoidance of triggering factors of migraine such as stress, fatigue, certain medications, alcohol and certain foods can surely help in improving the condition. In another possibility of TMJ disorder that can arise due to excessive teeth grinding habits, dental problems, misalignment of the teeth and trauma to the jaws, patient may experience headache, facial pain, ear pain, dizziness and nausea. However, in TMJ disorder, MRI is a useful investigation tool to diagnose the condition and your normal MRI report suggests it is a less likely cause in your case. I would recommend you to see a neurologist who can evaluate the details of your case and could better determine the insight of your situation. Additionally, possibilities of trigeminal neuralgia could also be evaluated. Hope this helps. Take Care & Regards.
I also have muscle stiffness(back and legs) and mild leg pain.