I was lethargic and spent my weekends sleeping --up to 18 hours of sleep a day, both Saturday and Sunday. After being gluten free for over 18 months I finally noticed that I was sleeping much less. Sorry to say, but some things just take longer than others, and we are all different,.... you have to stick with the diet and give your body time to realize that it can stop fighting everything all the time.
You are not stupid! You came here and asked your questions and laid out relevant explanations.... nothing stupid there....
I have found that taking a vitamin B12 supplement helps clear that brain fog. In fact, when I first started the B12 it was like someone lifted a curtain! No more brain fog!
Also, by the way, thank you!! For helping me to understand that I am NOT alone in this "laziness" --but IN FACT it may be part of the healing process of being gluten free (after being sick for my entire life until recently because I never knew I had celiac disease.).