Thanks mine seem more nerve related .Are you referring to fasciculations?
If so, here is a related discussion:
Muscle twitching (Fasciculations) and Limb jerking (Myoclonus) in ME
Maybe I should have explained my muscle twitching a bit better. With me it would be where a small area of skin (only say 1 or 2 centimetres across) would be just vibrating on and off for a few minutes.
Please feel free to enlighten me about it.