So... I have severe anxiety at this point. It started as social anxiety, then it kind of... crept into everything, because I came to associate every other aspect of my life with having to deal with other people.
A lot of the things that you've dismissed as bullshit does help and it just made me really sad that you think that just because someone doesn't know exactly where you're coming from that they don't have good advice.
Exercise, for example? Great advice. Going to the gym regularly and taking care of myself has reduced my anxiety in a lot of areas and it helps me be more confident in myself and my self image. I don't have to feel all anxious anymore that people are judging me about being fat. I don't have to constantly be paranoid that people are looking at me and accusing me psychically of being a piggy. I can completely eradicate that line of catastrophic thoughts, because I can longer justify them as plausible.
There are a lot of medications out there and there's a lot of alternatives based on which state you are living in. For some people, medication is a godsend. The most famous case that comes to mind is Wil Wheaton, who said that the medication finally allowed him to live normally in a way that he never realized was even possible. While there may be a lot of things that don't work for you, many people find great relief when they finally find the perfect pharmaceutical cocktail that works for them.
The breathing thing. My cousin first explained this to me, so maybe you were dealing with a more stressful person. It's not just about controlling your breathing. It's about... breathing. Breathing in the air and appreciating that life is in you, that you are alive, and that when everything else falls apart around you, you are still breathing. Breathing feels good, so you focus on that and nothing else. Just feel how good it is to be alive. Sometimes stopping to appreciate what you have is refreshing.
Mostly you sound very angry. Yeah, an anxiety attack in itself isn't a temper tantrum, but i've seen it manifest as such. My father has undiagnosed anxiety which is very difficult to watch, because he's such a kind and caring person. When he starts to feel like someone is judging him or when he feels like he's going to fail, when he panics, he gets angry and starts yelling, which causes an abusive atmosphere for everyone else around.
You may not control your anxiety, but you do control your own emotions. You control your actions. You control yourself. You make your own choices. Anxiety is not a parasite that controls you, it is a thing that blinds you to your healthy options. You do still have those options, though, and you need to learn to take responsibility for your own life and actions.
Self-awareness is incredibly important when dealing with this disorder, because it's one of the only ways to fight it without medication. You need to have discipline and temperance. Learn how to sort out what is you and what is the anxiety.
Stop blaming other people for not being able to solve your problems. You can get angry at me for saying this, but remember that I only took the time to write this because I want to help you. I know that I used to feel exactly the way that you do now. The anger is like poison and if you can't summon the bravery to face your anxiety, you will wind up being isolated.