I have muscle twitching... Worse than anyone here has described. It's literally 24/7 I get hundreds in a second all over my body ( at the same time). Mine are like u describe but also long, like the muscle will start the twitch at the top of my thigh and end at the bottom. I also have constant muscle spasms in my upper back ( area between shoulder blades) and sometimes my neck. I have only been diagmosed with sfn. Although my neuro wants to repeat my emg this month. I also jerk a lot, somedays worse than others, some days I only jerk at night while I'm trying to sleep other days I do it while awake too.