My toenail is dark gray and it feels like a aching tooth. it's not black like a fungus ?

Push'in too hard.: Nothing says aching like pressure, especially in the toenail area. The solution is to isolate the cause of the pressure and relieve it. The amount of discomfort it is causing, will dictate the level of treatment. It is hard it evaluate the condition without actually seeing and touching it, but my guess is the nail might need an x-ray, to check for bone issues, before lifting the nail gently off.