Is there an easy way to find hidden doors in a dungeon?
I spent quite a few hours exploring a dungeon trying to find a traitor for the Temple of Kynareth,
I even left the dungeon and reentered homing the quest target would relocate itself so I could find it, but I eventually happen to notice a doorway on my map,
which turned out to be a secret door in the wall, and there I found the damn trraitor, so anyway, is there an easy way or what?

You pretty much found the 'easy way'. Check you map, 3D and 2D, and if you see doors there that you never explored or noticed, chances are it's a secret door.

i have issues with these weird brick walls that i can go in through one way but can't go back.

Those aren't walls, they're teleporters. They zap you to another part of the dungeon when they don't simply kill you outright. It's a major pain to find your way back, but then, what part of navigating a dungeon in Daggerfall /isn't/ a major pain?

i was wondering why i could never go back where i came haha. but yea the are a pain. i got stuck one time because i went through one by walking through it in the wall, couldn't go back but there was one of those teleporters in the middle of the room instead of in the wall and it took forever for me to realize i was supposed to click on it instead of simply walking through..