My left thumb started twitching lightly about 12 hours ago not long after lifting a heavy object whichis something i do ofetn due my work in the mining industry in western australia. Yesterday i had my 2nd of 3 hepatitis a-b vaccination. should i be worried about this twitching? i am due to fly to south america for a holiday on monday. I have also recently tried to quit smoking and use the champix tablets but smoke when i have a few drinks after work. im 5ft 2'' and 63 kilograms. i use ventolin and simbacort and also contraception - brenda. I have recently had yellow fever vaccination and H1N1 vaccination.