I completely disagree on not listening to your brain. Your brain has an emotional side, some call it your inner child, that is the raw unfiltered you. You inner child might be screaming out for help because he doesn't feel safe and needs your help. That is worth listening to. You don't want to just grit your teeth and ignore your worries.

Your feelings are completely valid and there is a reason you have them. Don't ignore them.

That being said, you also don't want to let your brain run away and make you miserable with repeated worrying. It's a balance to recognize that you feelings are real, deserve to be recognized, maybe require action, but also to not let your worries dominate your life.