when used medically two of the most common side effects of botox are headaches and neck pain. obviously we know a lot of us have experienced the botox headache but what about the neck pain? I had my botox about 36 hours ago and my neck is killing me. I'm trying to tell myself its just because I had injections in my neck so the muscles are sore because I'm terrified that its a side effect that will last the next three to four months. I dont know if i could handle that! does anyone else have experience with neck pain from botox?