Having suffered from social anxiety I can tell you that from Tolle's perspective, social anxiety it is no more ''complicated'' to understand than any other condition or disease, be it mental or physical. It is all caused by our ego, and therefore I believe there is no ''specific'' advice than that which you already know.
If you (re)read The Power of Now and one day manage to dissociate from your thoughts completely ALL of your anxiety will go. But do not despair if it takes time. As says Eckhart Tolle, everyone's personal pain-body also partakes of the collective pain-body which is the ''pain accumulated in the collective human psyche over thousands of years through disease, torture, war, murder, cruelty, madness, and so on''.
There is no other possible reason for social anxiety than being possessed by your thoughts. Or as says Eckhart Tolle: ''It is not so much that you use your mind wrongly - you usually don't use it at all. It uses you. This is the disease.''
My experience was painful, the anxieties got so strong that everything collapsed and I fell into a deep depression. I was in bed for months, not able to even have a simple conversation or get out in the street. This does not have to happen for you, I am sure you can cure from your social anxiety by following Eckhart Tolle's teachings ( I wish I knew him at the time). But the good thing was that after having gotten out of the depression, my ego slowly began to die. It took me another depression and almost ten years to finally get rid of it completely (my ego as well as the anxieties
. The way to awakening was rocky because instead of looking into my past to find the deeply rooted reasons for my anxieties, doctors prescribed medicine. I was very thankful but it only numbed the pain. What ultimately really cured me, was the relationship with my loved one. In my case, it was a substitute for therapy. It is only after I managed to open up completely, be honest about my past, that I was able to be myself for the first time in my life (feel comfortable in my skin:-). Now, it's not about who you open up to, it's just about opening up...seeing where the evil thoughts, insecurities come from, accept it and it will go away.
If someone wrote me something as I am writing you now at the time, I would've thought ''little do they know about how much I suffer and how bad my condition is.'' . That is what I would've thought because when in pain and suffering, we always hope for a magic cure. I saw how you emphasized ''i don't mean just shyness'' and used the words ''complicated'' and ''specific''. That is the ego. If you want to get rid of it, see your condition as no more complicated than any other condition. Here's what says Eckhart Tolle: ''An illness can either strengthen or weaken the ego. If you complain, feel selfpity, or resent being ill, your ego becomes stronger. It also becomes stronger if you make the illness art of your conceptual identity: “I am a sufferer of such and such a disease.” See how profound it is? You shouldn't even see yourself as suffering from anything. He explains how this projection of disease in time and identification with it, is no good in ''The Power of Now''. I really suggest you (re)read it having in mind that you have no disease, it is our thoughts that drive us insane and ill. Do what Eckhart Tolle suggests to do in order to connect with your body, become aware of your thoughts and magic will happen. IT WORKS.
Your ego needs an identity, convictions etc.´, people who for example have traveled a lot ( are not sure what nationality they belong to), or who are physically different (be it skin color, looks, weight), or who are just very unordinary (because of their family or other), in short: people who are in some kind DIFFERENT are the ones who often suffer from social anxiety. They might seem no different in other peoples eyes but they themselves feel like aliens when they get out in society. In my case, I felt so uncomfortable most of the time I can't even describe how little I was able to enjoy life. My thoughts were killing me 90% of the time. Every time I'd be near someone I would imagine a billion things of why they are looking at me this or that way, interpret it my way and on it went ......for hours.....and hours......worrying non stop about situations I found myself in, about other people, sometimes not able to breathe or sleep till one day I got sick. My thoughts tortured all life out of me. Do not let that happen to you.
The good news is that there is ALWAYS a deeply rooted reason and once you identify it (become aware of your thoughts), accept them, surrender....they have no power over you, you are free. Eckhart Tolle says ''I cannot tell you any spiritual truth that deep within you don't know already. All I can do is remind you of what you have forgotten.''