Final answer:
Seeking the help of a mental health professional is a viable intervention for an EMT experiencing persistent stress despite using relaxation techniques and exercise.
Step-by-step explanation:
As an EMT experiencing increased stress levels, and having already tried relaxation techniques and exercise without sufficient relief, it would be prudent to consider seeking the help of a mental health professional. Mental health professionals are trained to support individuals dealing with stress and can offer a variety of stress reduction techniques which may include cognitive behavioral therapy, mindfulness, or other therapeutic approaches. This intervention allows for tailored strategies that address the root causes of stress and promotes long-term well-being, which is vital in a high-stress profession such as emergency medical services.