I go through bouts like this. It hadn’t happened for about a year. Maybe more. Then last month, I gave in. It usually happens to me during times of acute stress or when I’m experiencing a mixed episode. (This time it was a mixed episode). It goes away when the episode ends or the stress goes away. Like you, I don’t have an effective way of stopping until it’s ready to stop. Sorry I can’t help, but I can relate and understand.