I know this is an old post. Did you find out the reason for this ? How are you today ?
Hi!
You do not shiver because of a hypothalamic disorder causing hypothermia. There can be several causes like hypothyroidism, liver diseases, low Vit B12, adrenal insufficiency, liver failure and as a side effect of some drugs. Please consult your doctor regarding this. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.