Tilt management is the single most important skill in PLO.

The variance is the single most important factor that brings fish to PLO. A fish will rarely go on a 10BI heater in a tough NLH game. In PLO once a weak player has a 1000bb session, which will happen often if they are loose passive and gambly, they will never shake it from their minds that they are able to beat the game.

I have many break-even stretches/downswings playing 5-card. As with the variance of hold 'em, I just keep in mind the long term and evaluate my play, not my results. If I feel like I played well (or at least not poorly), I consider this a winning session. Also, a track record of playing winning poker is required for that long-term outlook to even matter. At the end of the day it's my self-assurance that I am a long-term winner that I fall back on when variance kicks in.

Having a bankroll is important for this mindset to kick in too. I don't know your situation, but for someone without around 100 BI the day-to-day can feel more important to their bottom line and increase the emotional turmoil.

Finally, I have set pretty strict session stop-losses of around 2 BI (for me, $600-$700). This mitigates the damage to my roll any given day and also softens the emotional blow when I do go on a downswing. At the end of the day, it is our money and losing it it isn't fun. Losing a set amount makes it more predictable at least and provides somewhat of an illusion of control in a game that we know is very swingy.