You might want to read up on some of the coginitive therapy ideas simply because the basic idea is that our thoughts and emotions are tightly linked, that in fact our thoughts (often very subconsciously) drive our emotions.

My T's favorite book for this is called The Anxiety & Phobia Workbook. He had me read just the middle chapters in the book. I don't particularly have big problems with anxiety and I have no phobias, but the middle chapters deal with self talk, the mistaken beliefs that we brought with us from childhood, and personality styles. It is a very quick and concise overview of the rebt/cbt-types of therapy approaches, and is really well-written with very nice exercises to work through. You don't need to read the whole book at all; just those 3 chapters can be really helpful.

His other favorite book is The Mindful Way Through Depression. Obviously all on mindfulness, etc. This is NOT my favorite book, but mainly out of my own stubbornness about mindfulness.