Anxiety
"I have been suffering with this anxiety problem for years and it was starting to interfere with my life.  I am a confident person socially, but my fear of presentations was huge and I would my voice would tremble to the extent where it sounded like I was full on crying. I researched medication for this fear and found propanolol. My doctor prescribed me with 80mg Half Inderal (Propanolol) and despite what some say, he was not hesitant about giving me a prescription and said he regularly gives it to musicians/public speakers etc. It has worked wonders for me, I no longer embarrass my self and now feel happy and confident. You may still feel nervy, but the adrenaline does not kick in. I have not suffered any symptoms and only take it seldomly."