Shakey

How does someone stop tremors? I get shakey when doing presentations on topics which I am not, "schooled" in. It is possibly a fear of making mistakes or not being my best, being unable to help - help the general public(I am in sales). Sometimes the tremors interfer with my job, other times they are only noticable and do not effect goal orientated movement. This is a new job, there are new fears - I see this. However, I can not really figure out what mental aspect is scaring me - making me shake. I am not afraid of being attacked or hurt. What questions should I ask myself - where do I dig & probe? I am 110% aware that practice will effectively stop the tremors. However, in the mean time what is suggested? What have you done or reccomended in the past? Lastly make sense of this:
I do not feel afraid. Infact, I am pretty fearless of people - generally speaking. I am paranoid about people but not scared. When I do the presentation infront of people I do not know I shake. This shaking makes them think I am scared or nervous. Possibly I am. . . Although I do not feel scared, jumpy or nervous - I JUST SHAKE. Their perception of my tremors has a negative impact on me. This seems to be some kind of social anxiety being blown out of control by a charcter flaw to be perfect. However, the only thing that physically manifests itself are the shakes. I can speak fine, my breathing is fine, my words are fine, except for these shakes - I AM FINE. Possibly the tremors are medical? But they do not always happen - this is why I think they are more mental.