If you're getting an ingrown nail on your big toe, suck it up and go to the doctor. It will only get worse and more painful. Infection is only one side affect. The doctor will freeze/numb the area cut the nail properly and clean it up. Yes it will hurt but for a much shorter time than if you try to pretend it doesn't exist. GO!
I think you could have developed a growth under the nail plate or in the nail matrix. Fungus would not prohibit a toe or nail growth, so there is something else going on entirely your foot. All the same I think you should visit a doctor.