If you've been to 4 GPs in 6 months and they all said it's anxiety, you should really believe it's anxiety.
Muscle twitching was my first symptom and not in one area, all over my body! Twitching 24/7. For a full year! I was convinced I had ALS, but of course I didn't.
Even now when I get angry or upset, muscle twitching is one of the first things to pop up.
It's one of the most common anxiety symptoms. Believe it!