I recommend The Now Habit if you found this line of thinking to be useful. It provides frameworks to understand why you have such mental blocks and more concrete strategies to try.
Curious about that book - did it help you? Silly questions, but serious: How much did it help? What, specifically, did you get from it? Asking for a relative who has serious anxiety issues (no, really, it's not me... I have depression, and Burns' "Feeling Good" helped me substantially, specifically by identifying brain-spirals I get into, which lead to depression, and once known can be avoided). I'd love to recommend something good for them. Thanks!
It's not hyperbole to say it changed my life. The most valuable thing I got from it is a good understanding of what's actually happening, and how I can change it. It's such a great, readable, easy-to-understand book (in my opinion). I've given away several copies.