Hi my mum is 80, has early stage dementia, Copd, minor gastric problems and had a mini stroke. She is still in dependant, lives alone and can still look after herself. However she has one thing that is bothering her the most, she has these episodes that I can only describe as a shudder which goes through her whole body and she feels icy cold, it can last from a few seconds to a few minutes, several times a day. The doctors cannot find what's causing it, she has had bloods done and everything is fine including her magnesium levels. Has anyone any suggestions?