With respect to self-help books, consider these, all of which have been found effective in clinical trials:
1) Unified Protocol for Transdiagnostic Treatment, by David Barlow
2) Managing Social Anxiety Workbook, by Debra K. Hope
3) Mastery of your Anxiety and Panic Workbook, by David Barlow
You can also look for a cognitive behavioral therapist who specializes in either social phobia (more likely to hit your problem) or panic (less likely). Make sure they use a tested protocol; get the workbook; use the workbook. Anxiety disorders are most effectively treated with empirically-validated CBT protocols like the three listed above. The results are stronger than with medications, without the pesky side-effect of habituation, rebound anxiety, and potential addiction. Good luck!