What makes a tooth sensitive that is not dentin and not abscessed. The tooth does not hurt unless used.?

For about 5 months this one tooth has bothered me. I did not think it was abcessed 'cause I already went thru 10 of those, this is like an electric shock or biting into fin foil with a filling. Cold makes it sensitive to brushing and I cannot bite doen on it. Left alone, it does not bother me. I did fall and hit my face skiing about 2 years ago but the tooth hasn't bothered me until recently. One time I did feel like I'd gotten a pecan shell stuck behind the filling in it but the dentist saw nothing. The first dentist I went to said it just barely showed the beginning of an abcsess so he did a root c, no crown yet 'cause it's bothering me. I went for a second oppinion, he took xray and said 'no cracks' root c looked good, filed it down as he thought it was bothering me because I was grinding my teeth. Went back to first dentist , xray, said looked fine, gave me antibiotics for the second time. The lower corner of my cheek bone Above the gums, above the laugh line is tender and feels bruised. Could this be a broken face bone? Crack? jaw problem? what else could be effecting this tooth?