I'm not diagnosed, but I have had experience with the "phantom phone". Mine started about where I would clip my cell phone to my waistband of my pants or shorts, and I would keep checking my phone. Then one day I noticed the vibration when I wasn't carrying my phone.
Not long ago, I had a little vibration feeling on the outside of my upper arm, and I didn't have an I-pod or anything strapped there. I think of it as my nerves way of saying "hello, I'm here!