Chronic Pain Following Thermal Burn Injury

The goal of this clinical trial is to learn whether progressive muscle relaxation (PMR), delivered either alone or enhanced with virtual reality (VR), can help treat chronic symptom, such as pain, itch, anxiety, sleep disturbances, and fatigue, in adult burn survivors. The main questions it aims to answer are: * Does VR-enhanced PMR (VR-PMR) reduce chronic pain, anxiety, itch, sleep disturbances, and fatigue more effectively than standard PMR? * Is VR-PMR a feasible and acceptable self-administered home-based intervention for burn survivors? Researchers will compare two self-administered intervention conditions, VR-enhanced PMR and standard PMR, using a randomized to sequence crossover design to see if VR technology enhances the therapeutic effects of PMR on chronic symptom management in burn survivors. Participants will: * Complete home-based sessions of VR-enhanced PMR * Complete home-based sessions of standard PMR * Report symptoms such as pain, itch, anxiety, sleep disturbances, and fatigue throughout the study * Use VR equipment provided for the intervention period (during the VR-PMR arm)