Yep, so true. I eat Paleo too, and that covers being gluten free while not involving expensive or hard to find "substitute" foods. I buy meat, vegetables, fruits, and eggs - that's about it. I am healthier, have more energy, just generally feel way better than before, and after a while the cravings disappear and that other stuff doesn't seem like food any more. I'd say try it out and see if it works for you. It can't hurt, especially if you talk to your doctor about it.
Lurking from the tail-end of 1st tri, and I have to agree!
I eat just generally low carb, and it's very simple to do - I eat meat, veggies, high-fiber fruits, dairy, eggs, nuts and fats, and that's pretty much it. When I am eating right I have more energy, my insulin level stays even, the weight falls off, and my heartburn and migraines completely go away.
I think too many people get hung up on the idea of 'substituting' things and that's where they run into the crazy things like the $6 mac and cheese mentioned. You have to adjust your mindset, and just realize certain things are no longer part of your diet. (If a substitution is needed that badly, cauliflour can be baked into a traditional homemade mac and cheese recipe for far cheaper.)
I disagree that a nutritionist is needed, just cut out the gluten products and add more veggies, there is no possible way to go wrong that way.