@Simji I know what you mean about wondering if you still had your earlier banks. But you're right, just put it down to a learning experience. We all go through stages of taking big chunks out of the bank, especially when you're trying to grow it. The silver lining is that at least you did it when you're learning and not experiencing big downturns for the first time once you've told your boss to shove it and you needed that money to survive!
When it comes to discipline you have 2 options. 1 - get a bot to do it and just remove yourself. 2 - have a game plan and behave as though you were a bot. That means, if you've written out your rules you have to follow it.
If you're worried about losing and doubling down then that might be a sign you're overstaking? I think there's a Buddhist saying "the vase is already broken" so when the vase does break you don't get upset because you knew it could happen. You have to kind of be like that with trading. When you place a trade think "this trade has already lost" and if that makes you feel uncomfortable then you need to ask yourself why.