I'm really worried about my sister. She's been experiencing this weird burnt plastic smell and taste whenever she eats anything. It's like everything just tastes and smells like plastic to her, and raw veggies seem to be the worst. This all started about two weeks ago, and she doesn't have a cold, cough, or fever or anything like that. Now she's also feeling some pain in her left lower jaw since yesterday. Do you have any idea what this might be? Who should we talk to about getting this checked out?