Thick nail, sharp shooting pains, Please Help!!

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Hi once again. I am experiencing ongoing trouble concerning my left big toe. First, awhile back the nail became impossible to trim, as it hardened and kept growing thicker and thicker. (still is too). Then, I experienced shooting sharp pains brought on suddenly while I was laying down, traveling up my leg also.
It soon subsided, and I just let it go. Then, this morning upon waking, I was experiencing terribly sharp pains in my big toe, as if needles were going underneath my nail. Very painful indeed. Has anyone had this happen, or do you know what this might be? Or maybe the causes? Any thoughts welcome!