Making your way in the dark
Some managers expect you to have all the answers, to all the problems. They are disapointed, unhappy that you can't give them what they need and consider it a sign of incompetence.
Their behaviour is a sign of them losing control, of fear, of insecurity. They reassure themselves believing that if they know everything, then everything will be alright. It's a childish behaviour that is very unsettling to see in managers.
The truth is that as long as you have a sound strategy, you don't need to know the details. Don't let anyone tell you otherwise: if you know where you're going, you can make you way a little at a time, tackling whatever gets in the way.
It's like driving at night with the headlights on: you can only see a little aways ahead of you, but you can make the whole journey that way.