I get betablockers for my family tremor. Basically my nerves are overly sensitive and if I am the slightest bit tired or hungry my hands tremble like I'm eighty years old. Luckily I just have to take a betablocker and I'm fine but I believe their main use is in arythmia and blood pressure.

Still, if my doc will prescribe it just for trembling hands, surely you could get it for palpitations that makes you nervous.