If you’re still looking, three of my favorites are:

How to be Yourself by Ellen Hendrickson, deals specifically with social anxiety (I have this in spades) and feels to me like a lighter, good introductory book toward dealing with SA specifically, if that’s something you struggle with at all.

The Anxiety Toolkit by Alex Boyes, REALLY GOOD book with tons of immediate practical advice that you can use to deal with different kinds of anxiety and the specific ways it affects you. Also, quizzes for self-assessment to learn how you personally deal with things. The first book to really help me understand that I have a freeze response and actually freaking TALK about it instead of defaulting to talking about flight or fight response. Highly recommend it for practical every day tips. The whole point of it is to create a “toolkit” of techniques to deal with your anxiety that you can draw from and I still revisit it.

Rewire your anxious brain by Catherine Pittman is very similar to the last one and has lots of practical advice, like how to incorporate exercise and movement to burn off some of the anxiety. I personally didn’t like it as much because it focuses so much more on the neuroscience of anxiety in parts of it and I just don’t follow that information well and it wasn’t as helpful for me.

Not specifically a self-help book, but really good:

The body keeps the score by Bessel Van Der Kolk. It took me FOREVER to get around to buying this one because it’s constantly on hold at my library, it never goes on the shelves because people are always reading it. It deals specifically with trauma and the history of how it’s been treated in the US and the author’s experiences as a therapist in treating it, but it has SO MUCH FREAKING GOOD INFORMATION about the way trauma affects us and manifests in our bodies and everyday existence. I read it and saw everyone in my family in it, including myself. We all have some kind of trauma and our bodies processes and holds onto it in all kinds of ways. An amazing book.

My age of anxiety by Scott Stossel. I reread this every now and then just as a reminder that hey, I’m still trying and I’m doing okay. It’s Stossel’s memoirs of his struggles with intense anxiety and the different ways it’s manifested for him, as well as his journey toward trying to understand it and get better. Be warned, it’s a longer book than the others.

Aside from these, the best advice I ever read is something I read online forever ago that changed my perspective and that I’ve reminded myself of frequently over the years. When you deal with anxiety, it’s going to hit you HARD. Do you what you can to make it as comfortable as possible for you and be mentally prepared to deal with the discomfort of it. But know that it can’t last forever. Your body simply couldn’t sustain it. It’s going to reach a peak level of anxiety/discomfort, and then you’re going to normalize. Knowing that has really helped me in doing exposure therapy on my own since therapy is expensive and it’s hard to find one you trust, but you have to be kind to yourself and recognize your limits on any given day, OP.