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From above description, there are two possibilities of your current problem:
-Recurrence of anxiety
-Withdrawal of venlafaxime
From the pattern of symptoms on gradual withdrawal of medicine, it is more appear due to recurrence of anxiety in your case.
In my view it is better to continue treatment. Cognitive behavior therapy from trained therapist also help in these cases.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal