This twitching seems to be my latest symptom too. It all started when a new burning upper back pain developed (as opposed to my normal lower back pain.
Doc ordered an X-ray (which just showed a normal 59 year old back with some mild compression/deterioration as far as he was concerned). But then in June my wife and I were walking and suddenly I noticed the front of my left calf felt numb. It really freaked me out. It became all I could think about.
We took 3 trips this summer, which involved a lot of walking. For all of them I was really stressed out about not holding up my end, ruining everyone's trip, not being able to walk. But I did. On our trip to Toronto and Montreal we walked an average of 8 miles a day.
But just before the Canada trip, I started noticing my left bicep would twitch now and then. Especially if I looked right at it. Within a few days I noticed that I was feeling twitches all over. If I think about it, focus on it, worry about it, I still do. Trying to meditate, send my brain messages of safety and realize that this is just a physical manifestation of my anxiety. My brain is on high-alert all the time about symptoms.
So far my TMS manifestations have been: childhood allergies, back pain, neck pain, TMS, IBS, TMJ, plantar fasciatus, tinnitus, numbness and now twitching muscles. Come on brain! I seriously can't have that many things wrong with me!