Professionals only please?

I have great anxiety when speaking in public. But I could deal with that. The problem is my skin turns extremely red from my chest all the way up to my cheeks (beyond blushing, it takes nearly an hour to go away). My face and neck gets so red that it is ridiculous and is unable to be hidden. The fact that these symptoms are so visible is embarring, which exacerbates the issue; then it becomes a vicious circle. What specific therapy might help this. If none, is there a medication (not anti-anxiety, those have not worked) but any other that might help with this, even just for the time a presentation usually takes. I am a graduate student in psychology, and I feel that these visible symptoms of anxiety will lessen my credibility with fellow students and professors.