... mg then down to 12 1/2 mg not realizing the damage it caused getting severe vertigo. I was hospitalized for the vertigo over night with nystagmus. It was torture. I reinstated to 25 mg now for 6 weeks but feel lightheaded when I wake up. I feel like a zombie on this drug, no energy and tired. Can I go back to 12 1/2 mg being I'm so med sensative. I've been on sertraline 15 years and can't seem to get off of it without having severe vertigo. Any help would be appreciated