First time 20 units for "11's", injected by my trusted and highly qualified dermatologist. The day after the injections, I had a sudden onset of extreme nausea. During the following month (3-6 weeks after injections), I experienced dizziness, vertigo, headaches and nausea. Week 5, my left arm went completely numb for several hours, and my headaches started to feel really unusual, like a pressure behind my eyes. Week 6, my headaches got worse and I started to develop a slew of other symptoms - a neck pain that radiated up and around my neck in waves, a continuous dull headache, along with waves of head pain and an intense pressure that radiated up the sides and around the front part of my head, plugged ears and ear/jaw pain. On and off pain/weakness in my legs, on and off tingling in my left arm, trouble swallowing, tinnitus. I have had blood tests, CT scan and MRI, all tests came back normal. The symptoms settled down about 4 months after injections. Currently, at 1 year out, still dealing with milder symptoms: daily head pressure, nausea, trouble swallowing, arm and leg aching/restlessness. I am not alone, I belong to a Facebook Botox side effects group with close to 7000 members, and many similar experiences (many way worse). This has been hell, don't do it!