I was taking Xanax for about 3 weeks but I am no longer taking it. I have been feeling shakiness and jittery every day since I started taking the Mirtazapine, which I just attributed to the withdrawal of Xanax. But the Mirtazapine is making my tinnitus worse and this morning, I woke up with my left arm numb. I have also felt a numb sensation on my left leg. I still have the shakiness feeling. I think it is the Mirtazapine.