I've started taking sertraline for anxiety and panic attacks. I'm on day 3 and feel awful. I feel really wired and edgy and a bit dizzy. My jaw is clenching a lot, I feel a bit nauseous and the worst is, I can't sleep. Waking all hours of the morning and not been able to go back to sleep. The pharmacist said side effects will wear off, just wondered if anyone could share their experience with me and when I might expect to start feeling better?