I normally do not recommend books I haven't personally read, but I purchased these two anxiety self-help books for a family member and he reported they were helpful, so I will mention them here:

-Hope And Help For Your Nerves (Claire Weekes)
-When Panic Attacks (David Burns)

These books have a ton of positive reviews on Amazon and that's what initially drew me to them. Then I read the synopsis of the texts and some of the reviews and decided they might indeed be really useful for someone who is suffering from anxiety...

--------------------------------

The below referenced texts I actually did read and recommend them:

The Power Of Now (Eckhart Tolle)
The Untethered Soul: The Journey Beyond Yoursefl (Michael Singer)

(both of these texts discuss the nature of Consciousness and explain the workings of the physical mind, both are intended to guide you to realizing that you are the Consciousness (or Awareness) that exists independent of the physical (egoic) mind)

Mind Is The Master (James Allen)

(This is a collection of the author's works, they are inspirational words of wisdom intended to motivate you to refine yourself and improve your state of being.)

All of these texts can be found on Amazon.com if anyone cares to look into them...

Happy reading folks.... It's a great way to expand your Awareness and alter your perception - which ultimately serves to positively change how you feel within. : )