dchrzano, with all SSRIs and SNRIs, there are very few (if any?) that you can suddenly stop.
Speak with your ordering physician/NP about weaning off of it.
You must have a plan in place to gradually decrease your dose over time. And it may take months for you to come off it without major distress to your mental health and awful withdrawal symptoms. But it can be done.
I have found some prescribers wean you down too fast. Be careful of this. Go nice and slow despite the length of time it takes. It will take cutting the pill in small increments to wean off. Suddenly stopping one pill (or pills) will not work as you found out. Get a pill cutter...you will cutting it in tiny pieces for a length of time on a daily basis.
Good luck and have patience!