Land of painted caves

I was so excited when this book came out. I bought it in march or April, right around the time when my thyroid medication was lowered and I started having problems because of that. One of the problems is that I get brain fog and I can't focus. I read a paragraph over and over and can't hear what I'm reading so I have to put the book down. I picked the book up last week when I started taking the correct dose. I red the whole book in 3 or 4 days.