Welcome! I discovered I was gluten intolerant after starting my first low carb diet in 2005. Like your SO, I had all the symptoms but no one ever 'connected the dots'.
I also want to do the Whole 30 challenge - I was going to start in March but starting next week (Feb 27) sounds pretty good - I may join you if that is OK.
I have not bought the book but am planning to cut dairy, coffee, wine and my last grain - rice. Is that it? I read that I can use ghee to cook if I want it. If you can give me any tips I'd be very grateful, and I will subscribe to your journal so I can keep track of how you are going too.