Hello~You need to see a chiropractor,all your symptoms point to misplaced vertebrae in your spine and neck. You should take the x-rays to him/her as they have many more hours of training than most MD's. The chiropractor will look them over, when they find the areas that need attention, they will concentrate on the specific areas besides adjusting the rest of the body because the body works together and if one area is adjusted, the other areas may need some help too. Since all the tests you have had have been negative, I am fairly sure that the chiropractor will be able to help you.
As to your tongue burning, that is a sign of vitamin B deficiency. You need to take a good, high-potency B complex and add to it, extra Vitamin B 12 and B 1. Also, add Brewers yeast to your diet, this will also aid in bringing up the "B" levels. It tastes wonderful on pop corn.
I hope you feel better soon, and, again, please see a chiropractor and get those "B"s.