Hi i am Dr Ahmed Aly thanks for using healthcaremagic site , I had gone through your question and understand your concerns .. For my patients i recommend painkillers like advil when needed ,hot massages with topical gels , muscle relaxants ,physiotherapy will be effective otherwise i suggest Xray and MRI to exclude cervical herniation and some lab investigations for proper diagnosis and management . excess salivation with the metallic taste is a sighn of infection and / or underlying disease when infection goes away it subsides or even it might need some mouth washes an more frequent tooth washing .rarely its a sighn of CNS disorder or a kind of allergy . Please click THANK YOU and consider a 5 star rating with some positive feedback if the information was helpful. Hope the above information helps you, Any further clarifications feel free to ask.