Hello, In my opinion, some dental infections can drain in the mouth. Jaw function difficulties and trauma injury seem to indicate a dental exam should be considered. Dental infections that result in an abcess draining can cause a bad taste often described as metallic. Inflammation and swelling can cause discmfort and difficult function in the jaw and even eye. A dental exam and xrays can help you diagnosis an infection. This would need treatment. Antibiotics can help control the spread of an infection. The source must be treated. root canals or extractions are treatment options. You indicate trauma or an injury. Was there any damage to your head? You could have fractured a root or broken a tooth. Other damage and conditions are possible that now need evaluation. The facial nerve can affect the eye as well as jaw function. Bell s Palsy can have a one-sided effect with difficulties that you mention. Your heart medication may have side effects. If you have a dry mouth your taste can be affected.