I have not read the book myself, but I sure identify with those feelings when I first found JWD/JWN and learned the truth about 'the truth'.
I'm guessing it's that you identify so closely that you are reliving the experience.
Maybe put the book aside for a few days (or weeks), take some deep breaths, go for a nice long walk and re-connect with your current life.
I agree with your husband, don't go back yet - if ever. If you want to see some of their techniques, read up and follow Blondie's series: "Comments You Will Not Hear at the Watchtower Study".
I don't know your current status, but if you have faded, showing up will put you back on their radar.
Do happy things and think happy thoughts. You are not under their control now.
-Aude.