"Worry" refers to fear, dread, anxiety, brooding, guilt, unease, paranoia, depression, suicidal thoughts, mild to severe schizophrenia, and catastrophism. Worrying is a learned, unhealthy habit, and can be replaced with healthy habits.
Worrying is an attempt to control the future or fix the past. Neither are realistic nor possible, since the future and the past do not exist. This habit can be replaced by the habit of shifting ino the present, the only time that exists.
Analyzing the past and planning for the future are cognitive skills all human possess. They help us understand past events and influence future ones in a healthy way. Worrying occurs when the analyzing and planning just won't stop.
Worrying and tightness over time restrict the circulation of energy, blood, and fluids to any and all muscles and organs. This "qi stagnation" is statistically and theoretically tied to a long list of physical ailments. Good detective work begins with a search for connections between mind and body, fear and tightness.
Worrying is just a habit, learned from other worriers. But we can't just let go of an unhealthy habit without finding healthy replacements.
When you struggle with a problem that seems to have no solution, how does your body feel? Is there by any chance a bit of nervous energy in those muscles, aching to be put to use. There is for me. So I put on my gym shoes and transfer my consciousness from the mind to the body. That's an excellent way to eliminate qi stagnation and worry. And sometimes, the answer to the problem appears out of nowhere during or after the exercise.
Another piece of first aid advice is to find others in need and help them.