Hi. I'm Manfred

I took a break for poker few months ago, recently I came back to the game. Decided to play the lowest stakes as posible (I was a NL5-NL10) regular marginal winner in average. I deposited 60$ and started at NL2 and managed to build up to 110 in 3 days. Then I played a freeroll and win second place. I cashed for about 310 euros. So my bankroll was is about 490$, then I played like 400 hands at NL5 and got crushed for 5 Buy-Ins (3 times AA got craked). The thing is that I was not able to think rationally during this session for cause of emotions (I chased bad odds draws, 4-bet trash, and called 3-bets too light). It happened to me before but this time I had the money so I didnt care that much to lose it. So I want to know how would you approach this kind of situations. What would be the bankroll management system You'd use.

Thanks