Your symptoms are suggestive of agoraphobia or panic attacks. Agoraphobia is an anxiety disorder, often precipitated by the fear of having a panic attack in a public or unfamiliar place.
I sincerely advise you to consult a psychiatrist and discuss this with him.Treatment of agoraphobia includes graduated exposure therapy combined with cognitive therapy and sometimes anti-anxiety or antidepressant medications. When you have such kind of symptoms, Breathe slowly through the nose using the diaphragm and abdomen. Do not breathe through the mouth. Talking with a supportive person or your loved ones who can offer support and comfort will also be helpful.
Hope it helps.Take care and pls do keep me posted on how you are doing or if you have any additional queries.
This sounds like stage fright, or performance anxiety.
There is a medication that can help this, but you need to see your physician for an evaluation and prescription.
Wishing you the best,
p.s. You can google for more information.
I have similar symptoms and still do every now and then- I have a heart murmur and I think it might make it worse. I blush quickly and tremble to the point of hearing my heartbeat in my voice. I've noticed that the more I face what bothers me (in my case speaking in front of alot of people) I get better at it, if I don't do it for a while I get worse. Like she said, stay calm- breathe slowly, try to use a stool or sit on something while you are facing an event. Sitting helps me ALOT! For some reason it keeps me from getting jittery. Just remember that you're not helping yourself by getting nervous! Drugs and a physciatrist are just money suckers and you'll never really get rid of it, you'll just be drugged. :P