Sorry, I was trying to be concise but ended up being a bit reductive.

I agree that both anxiety and doubt are experienced as a mixture of thought and feeling. At the height of my experience with anxiety, it generally arose in one of three ways:

1. I have a thought that makes me feel anxious

2. I consciously sense something (e.g. a chest pain or strange sensation) that leads me to thoughts that make me feel anxious

3. A feeling of anxiety is triggered by some unconscious stimuli, which leads me to thoughts that heighten/prolong the anxiety

The pattern here is that regardless of the anxiety's origin, it is thought that ultimately decides how it's handled. That is what I was trying to get at. Sometimes those thoughts might be subconscious or deeply embedded patterns of thinking, but they are thoughts nonetheless.

It was also a gross oversimplification of me to say that anxiety ceases to exist once acknowledged. What I meant to say was that rather than getting caught up in thinking about or around the anxiety, whether its experienced as a thought or feeling, one should instead non-judgmentally acknowledge what they are experiencing and in that moment let it go. It may come back again and again, sometimes instantly or maybe an hour later, but again acknowledge it and let it go. This can be a very long process, but gradually you train the mind to not instantly react to anxiety. It gives you a space between thought and feeling that allows you to decide how to handle it, rather than letting the mind run away with itself.

With enough patience and introspection you may come to realise what it is that's behind your patterns of thinking. For me it was an innate fear of situations in which I had not planned for. I used to imagine how events in my days were going to go, often even rehearsing conversations I was going to have. This lead to anxiety whenever things went 'off-script'.

I recommend reading this chapter from Jiddu Krishnamurti's book Freedom from the Known, which was a great help to me during my most anxiety filled time. Here is a choice qoute:

At the actual moment as I am sitting here I am not afraid; I am not afraid in the present, nothing is happening to me, nobody is threatening me or taking anything away from me. But beyond the actual moment there is a deeper layer in the mind which is consciously or unconsciously thinking of what might happen in the future or worrying that something from the past may overtake me. So I am afraid of the past and of the future. I have divided time into the past and the future. Thought steps in, says, `Be careful it does not happen again', or `Be prepared for the future. The future may be dangerous for you. You have got something now but you may lose it. You may die tomorrow, your wife may run away, you may lose your job. You may never become famous. You may be lonely. You want to be quite sure of tomorrow.'

Now take your own particular form of fear. Look at it. Watch your reactions to it. Can you look at it without any movement of escape, justification, condemnation or suppression? Can you look at that fear without the word which causes the fear? Can you look at death, for instance, without the word which arouses the fear of death? The word itself brings a tremor, doesn't it, as the word love has its own tremor, its own image? Now is the image you have in your mind about death, the memory of so many deaths you have seen and the associating of yourself with those incidents - is it that image which is creating fear? Or are you actually afraid of coming to an end, not of the image creating the end? Is the word death causing you fear or the actual ending? If it is the word or the memory which is causing you fear then it is not fear at all.

I hope this clarifies what I meant.