For addictions, I would suggest Julia Ross's books The Diet Cure and The Mood Cure.
The Diet Cure: The 8-Step Program to Rebalance Your Body Chemistry and End Food Cravings,Weight Gain,and Mood Swings--Naturally: Julia Ross: 9780143120858: Amazon.com: Books
The Mood Cure: The 4-Step Program to Take Charge of Your Emotions--Today: Julia Ross: 9780142003640: Amazon.com: Books
Addictions, and this can relate to addictive behaviours as well as substances, seem at root to be attempts to self-medicate. There are various neurotransmitters (chemical messengers in the brain). If there are deficiencies of one or more of these you won't feel quite right. What people discover is that they suddenly do feel better -- temporarily -- when they take, or do, such-and-such. And this is because a neurotranmsmitter is getting artifically pushed by what they're doing.
The way out of this seems to be to ensure that there are always adequate supplies of all the neurotransmitters. A good diet will help. Temporarily, you can take amino-acids (the building blocks of protein) that are precursors to whichever one or ones you're low in.
There are tests and quizzes that will show you that. Have a look at Julia's books, and also at her sites online. Best of all would be to find someone who knows about this stuff to work with.
Also you might make your way over to Sean Croxton's "Underground Wellness" site. He has at least one podcast interview with her and also a couple with Dr. Dan Kalish, who does something similar.