First it would be helpful to develop a social network including friends to help you identify the behaviors. Another thing is to develop a list so that when you hear it you will know it..
But most importantly, is the belief will continue unabated, uncorrected and without a corrective experience.
I would recommend the use of Cognitive Behavioral Therapy. In CBT, one is taught new ways of thinking and behaving and as a result, one's mood improves. anxiety and panic attacks, self worth increases. . In addition CBT is evidenced based as the most effective form of treating anxiety. See:
If you require further clarification or more information, feel free to ask!
First allow me to suggest that what you are using is not truly effective. So you have nothing to lose by trying something different. I appreciate th reticience in placing the burden on a briend. It would be the nature of the friendship. I picked the Cognitive Behaviorial Therapy orientation because it is pragmatic.You mention "other than weekly psychotherapy" that would be large step forward, considering you prior track record. Take a chance. Here is a good CBT work book Cited from amazon.