Hello~I am sorry you are having these uncomfortable symptoms.
What I am going to suggest may sound strange, but since you have tried everything else and test "normal" this might be your answer. I would see a chiropractor. You may have some pinched or misplaced vertebrae in your neck, at times, this can cause some of the symptoms you are experiencing. The chiropractor will take some x-rays of your cervical region (neck and upper back) study them and then discuss a plan of action. Many times, a few adjustments are all it takes to start feeling better.