I am an NP and in my first semester of CRNA school. It was a difficult decision for me to make, going back to school, if for no other reason than I actually really enjoyed being an NP. So, I can certainly empathize with you. I think that what it boils down to is what you really want when all is said and done.
I, as many have, had to move to a different state 3000 miles from home, family, and friends. And, I've got to say that it's not a whole lot of fun being that far from your known support systems. As far as school itself goes, let me assure you that it is no walk in the park. Not to sound cocky, but it's not that it is necessarily that difficult (perhaps because having been through NP school, I've had alot of the Phys and Pharm stuff already), but it is the sheer volume of material that is overwhelming. I am literally in class 8 hours a day at least three days a week. And the time not spent in class is spent trying to stay caught up on your studying. You will really have precious little time to spend doing much of anything else. You will need to make sacrifices should you decide to do this, and the bottom line is that you just need to decide if those sacrifices will be worth it in the long run.
Like I said, for me it was a difficult decision to make, but I am convinced it was the right one. Also, you might want to consider asking your program if they will hold a spot for you. Last spring after I had been accepted, I actually debated not going for a brief time. When I asked the director, she told me that they would hold my spot for a year if I wanted. So that might be an option for you.
Anyway, best of luck to you. I know the exact position you are in and it's not a fun place to be. Also, for what it's worth, I am post-Masters as well, and from what I have been told by upper-classmen, that will be a HUGE benefit. As I said, the volume is overwhelming, and to throw a thesis in on top of that ... well, I can't imagine.