are you on anti-psychotic medication? if so then you really should talk to your p-doc about the tremor...

if not... then having a medical check-up would be worthwhile (just to rule out physical causes of the tremor).

if it is a psychological / anxiety thing (where the rush of adrenalin is caused by psychological factors rather than physical factors) then propranolol might be the wonderful magical cure for you :-)

it isn't often one gets to say that...