I have not been on Pristiq but had a terrible experience with withdrawing from Effexor (similar medication), so I can empathize with the miserable symptoms! Unfortunately, for me, the dizziness, visual issues, and nausea/vomiting lasted several months. I hope it is much faster for you! One thing that may help is that you are starting a different antidepressant - for me, I was going off the Effexor completely and not starting a new medication.
If you have any nausea, I found that ginger tea was very helpful.
Good luck, hope you feel better very soon.