I'm sorry to hear about your accident and the problems you're experiencing. Without seeing the specific changes under your eyes, it's hard to provide a precise diagnosis. However, these changes could possibly be due to fluid retention, muscle tension, or stress related to your TMJ disorder, bite problems, or neck injury. Temporomandibular joint (TMJ) disorders can cause a variety of symptoms, which can sometimes include facial swelling or changes in facial appearance. Similarly, a neck injury could potentially lead to changes in your facial appearance, particularly if it has affected your lymphatic drainage or has led to chronic inflammation or tension in the area. Natural treatments might help, depending on the exact cause. If the changes are due to fluid retention or inflammation, lifestyle modifications such as reducing salt intake, staying hydrated, and using a warm compress may help. Physical therapy or exercises could potentially help if the changes are related to muscle tension or misalignment. If the issues are related to your TMJ disorder or bite problems, treatments could include dental interventions, physical therapy, or potentially surgery, depending on the severity of your symptoms and the underlying cause. However, it's crucial that you consult with a healthcare provider for a proper diagnosis. They may refer you to specialists such as a dentist, an oral and maxillofacial surgeon, or a physical therapist, who can provide a more detailed evaluation and tailored treatment recommendations. Please do not delay in seeking medical attention.