The cause of anxiety can´t be found in the content of anxiety.
The cause shall be found in the separation of the analyst and the analysed.
You have the existential condition, the anxiety. This is the fact, it is not in itself a problem. Then the analyst places himself outside the anxiety, analyses it in order to discover the cause of it, compares with earlier and hopes and desires something else, namely to get rid of it.
The analyst slides therewith off from the Now´s fact.
And the Now´s facts, seen from the analysts´ past or future, become a problem, anxiety-causing.
When the analyst is seeking the cause of the anxiety by comparing with earlier, and by desiring something else, he only isolates himself further, and therewith increases the anxiety.