Here is a yardstick that I've found works really well when trusting your gut: if and only if your general mood is peaceful and calm can you trust your gut.

Otherwise it doesn't work, that knowledge is blocked off by anxiety, fear, anger etc.

Never once has this failed me

I agree, but this does not work for people who are unable to get into a peaceful and calm mood ever, and they aren't even "trusting" their gut, their view of the world is completely distorted by it.

Again, not disagreeing. But if you're suffering from (C)PTSD, that advice might backfire by packing on even more feelings of shame onto your shoulders.