Worst down swing?

Last month, I had the worst downswing I've ever had in my life and I was significantly down over about 25,000 hands. I've rebounded enormously this month and am way up over the last 20,000 hands, like.. double what I was down, but it was kinda creepy and I'm wondering how abnormal a downswing like that is. We all have days where it seems like the math is simply not on our side, sometimes even the better part of a week, but a month long downswing is very disturbing, especially when you can't understand what you could possibly be doing wrong.