The symptoms sound, very much based in anxiety, but the real question, I have, is, do you experience these same symptoms at other times, or just when you are faced with a possibility of an intimate encounter? If this is the only time these symptoms manifest, I would suggest seeking the help of a professional, and telling them, what you have said here. I have had similar symptoms, but never in the same situation. I really think, you do need to ask someone, who is trained, to ask the right questions, and help you come to a conclusion, so you can finally get help. There is no reason to keep suffering, or feeling ashamed. I hope you get help, and work through whatever it is, that is triggering such a strong, fear response.
