I've been under a lot of mental stress recently. Not long ago, my father was hospitalized for a month. Now I worry about my parents' health every day. I doubt it. What should I do?

Everyone's physical strength is caused by their own and environmental factors, and we can't change it. What we can do is to be filial, care for them ideologically and materially, and make their material life rich, happy and joyful. This will also promote their health. You don't have to doubt and worry. Being able to do the above three things well is the real filial piety to parents. What's the use of worrying about yourself?