Your concern is certainly valid...I recommend that you discuss your concerns with your physician again. Given the fact that you have already experienced adverse symptoms the last time you stopped abruptly.
Eventhough this time you are replacing Paxil with Pristiq, I would still suggest that you do not abruptly stop using Paxil and switching to Pristiq without reconfirmation from your physician. Typically patients are weaned off and the started on another medication.
I hope this was helpful.