Two Different Worlds

As I delve into writing my book I find that some parts just flow out of me. Its like it just happened yesterday instead of almost 3 years ago. But I also find that the writing takes me to a different place, a different world. Its as though I'm existing in 2 different worlds and I have to juggle the two of them in my mind. The only difference is when I'm writing the book I'm lost in it and when I'm outside of the writing I feel like I'm still there. I had heard of writers secluding themselves when they write, now I see why. Its a precarious balance at best. But I don't have luxury of seclusion, at least not at this point, so I must balance the best that I can.