I'm helping my dad with his high levels of stress. what should i do?

Varies with need: There are many types of stress, and i don't know what your father is experiencing. If he's a caregiver for someone, you can give him respite now and then. If he needs companionship and listening, you can provide this -- take him out for a meal or a walk. You can also encourage him to get additional help as needed -- through church, support groups, or seeing a therapist or physician, etc.

Agree w Dr. Pappas.: You can also provide basic info about healthy lifestyle. Like aiming for 7.5 - 8 hours of sleep/ night. Daily physical activity is optimal in a green space. Eating healthfully. Cutting out junk carbs, caffeine ; alcohol (or moderate). He might benefit from meditation or yoga.