I too have been in misery for 14 months. i have been told my itching head and electrical sensations are probably from the drug cetuximab. i was one of the first to have this target therapy drug instead of cisplatin. it is supossed to be less toxic? i am also experiencing severe cramp at the back of my head down both sides of my neck and under my chin. i did not have any surgery apart from the removal of my tonsils. my GP said he thinks it is stress? having read your post, it is more likely to be from the radiation. i am experiencing a very red scalp, hair loss and this terrible itching. my jaw has also gone very stiff. this all happened at around the same time 14 months ago and is not improving.