The "what if they are right" thing will be there for quite a while (i think most of us have had this to varying degrees) and only really dissipates with proper research. Until you prove for yourself (i.e dont just take anyones word for it) that it is all baloney by doing real research then you will be stuck in this mind set.
Heck, I've been out 7 years, know it's a cult, I'm an atheist yet still occasionally the nagging ingrained thoughts will come that I wish it were true or that just maybe they were onto something. It is just the programming I have suffered since birth surfacing now and again, I know this and dismiss those thoughts or feelings for what they are, ingrained thoughts and feelings based on zero evidence whatsoever and regrets over a wasted life.
In case you havent been there: www.jwfacts.com is a good place to start.