Well, I start to get them if I miss a dose of Zoloft and if I just stop it can get quite bad. Before I knew what others called them, I would describe them as sort of a strobe light in my head. No lights of course but it feels like a very fast vibrating type beat. It can make me scrunch my face if it's bad. They are very uncomfortable and I think you would certainly notice it. Its a feeling that cant really compare to anything else I have ever felt. Amy