Don't feel bad, it's happened to the best of us

*SPOILER ALERT*
Your house in The Quest: Original is down Fishbone Avenue in Mithria. When in Mithria, go east in the Main City region until you hit a blue road, then head south until you hit the second-to-last door. That there is your house (If you chose to save Freymore; If you dominated Freymore, your "home" is actually the Mithria palace).