Hi I am wondering if maybe it could be ticks, I had exactly the same sort of thing happen when I was 10 ( I'm now 25) and after testing eeg, which was found to be abnormal I was put on tegretol and they went away allong with a fair host of other issues.
See your doctor and get thier advice.
All the best David.
Your twitching of your arms and legs sound like something that I have and take medicine for. It is called restless leg syndrome which can affect your arms and legs. It usually happens to me at night or when I have been sitting for a long time. I take Mirapex for it right now.