Thank you for your reply,
Pristiq is one of the more common medications which causes withdrawal symptoms when stopped abruptly. If anyone has been on an anti-depressant (especially Pristiq) for more than 30 days, it should be tapered off very slowly, preferably over a month or two. The cardiologist should have known that so I am not sure why he didn't instruct you to such.
The symptoms you are experiencing are typical for withdrawal symptoms of stopping Pristiq. As a matter of fact these are the most common symptoms of withdrawal.
The usual dose of Pristiq is 50 mg daily, taking 100 mg is over-medication so your cardiologist was right about the high dose of it.
Withdrawal from abruptly stopping Pristiq can be up to several weeks. My recommendation would be to go back on Pristiq 50 mg until you feel better and then slowly start the weaning off process. Otherwise you can just weather out the symptoms for another 2-3 weeks. Unfortunately, there are no medications which will reduce the withdrawal symptoms other than going back on the medication and then slowly going off of it.
I hope you find this information helpful. Please feel free to follow-up with any other questions you might have.
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Best wishes and good luck,