Wow.. I'm so sorry.
I had this happen once, but with an opposite outcome. My first "big" hit on stake actually.
Meant to type 0.47 wager, shooting for a x69 multiplier on Limbo.
Ended up being a $47.00 bet (I only had $50 in the wallet).. and it hit!
I often fins decent wins happening in clusters so I personally don't switch my seed after a single win, however I will after I feel the seed has "lost its magic".
I often go in with a small balance and at times I fairly big. My typical scenario would be starting with 60-100$, and if I get the balance to 500 or greater, I cash out half. If and when I've reached 1k or more I typically cash out and leave about a $500 balance.