Hey Bonbon - you bet it's scary
Ten years is a long time to spend at your workplace. I mean, think about it - you spend 1/3 of your life at work if you work full-time! However, what you're feeling is perfectly normal. You have a comfort level where you are at now, and that will take a bit of time to achieve at a new job, but you'll get there. Change is stressful, so be extra nice to yourself. Hope everything works out well in your new job. Have a great weekend!
Love and hugs.
PS: I hope he doesn't show up either :p