Please help me. My horse has navicular pain and is overdue for injections but is showing bizarre head symptoms. He is tossing his head, sometimes violently, and then reaching down to scratch his face with his legs. Tight jaw and clenched teeth and lower lip. Will not eat. Looks so uncomfortable and unhappy. Almost unsafe to walk him around, being 17.2 hands and cannot control his head tossing. PLEAES HELP. Gave him 3 bute in paste. Don't even know if he swallowed it. Anyone???? He also has shivers that effect his hind legs. Navicular injections in front feet only.