Tantee, congratulations!
I really can relate. It has been nearly 4 years for us as well and I also had a lap in March this year (diagnosing & removing moderate endo).
It's a nerve-wracking time, but such a hopeful one too (for me, I was like, well, I'd much rather stress about this than IVF stuff). It does seem surreal at times.
Take is easy, just one day at a time (there's no other way) and hope that time does fly til your scan. I also think a lot of time sleeping and spoiling yourself too is good, eg doing just what you want, movies, trashy magazines etc (these are the things I do as a treat). Also, you might not be "over the moon" every day and that's ok too.