Anxiety
will most definitely bring the PVC's on, in fact, most folks, like myself, that have high anxiety, have the darn things. They might subside with anti-anxiety drugs, some they help, others, they do nothing. Oh, by the way, panic attacks can mimic PVC's and PVC's can mimic panic attacks.
PVC's can come in many forms, some are the small "blips" as I call them, some come in twos, threes, and some can make you feel like your tummy is dropping.