It could be a side effect of the new medication. Many of the antidepressants have EPS side effects that mimic neurological disorders. Could also be serotonin syndrome. I would talk to the prescribing physician. If it's the med, when you stop it, the symptoms should stop shortly after, however, the MD needs to be aware that this is happening.
As the nurse above said, the symptoms could definitely be related to the medication and the prescribing MD should be notified right away. Don't wait on this one. Get it checked out.