Sometimes worry is compared with precautions and your commitment to do the right things and it shows your concerns about that but when we over do it that's the dangerous part.
As they say excess of everything is dangerous, so if there is balance then being worried is fine.
Negative thoughts bring negative results, but sometimes it is hard to stay positive.. Listening to motivational video helps a lot when you feel down.
suf1an (56) good job
Balance is definitely key, but also surrounding yourself with positive, uplifting people will help