Hence it could be
Trigeminal neuralgia, abscess in tooth, exposed root canal, internal ear infection, maxillary sinusitis, TMJ, migraine, shingles or fibromyalgia localized to face. Since you have TMJ like pain and cold sores, possibility of shingles should be looked into.
Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into.