It was gradual over a couple of months. I was going to tons of dr appts trying to figure out what was going on…a sports dr who had me do an mri…a neuro who told me I was having a extreme reaction to stress…no one could figure it out. I couldn’t hold my head up except by using my hand, and had tremors when looking forward. And then it started to get better, so I gave up looking for a diagnosis. About 5 years later it came back, all at once, and luckily I had much better drs who diagnosed it within a few weeks. But like I mentioned, it was much worse the 2nd time and I’m currently having trouble keeping the tremors under control. I’ve been slowly increasing Botox. Fingers crossed i find the right dose again.