<s>[INST] I woke up last night the air conditioning was on high but that s normal I am in Vegas and it s 112 I was not out in the heat for any length of time but anyway I had these uncontrollable chills I used all blankets turned the air off used a what pak but kept shaking and was SO cold i was aching in the legs and my fingers were so cold it lasted until I feel asleep I have never had anything like that happen before should I be worried? [/INST] Hello, As this should be related to the vascular supply in the lower limbs a physician should be contacted for having a thorough examination of the body. As this kind of chills is common using the AC, but there might even be the possibility of an underlying cause.  Fixing up an appointment with a physician should help him to understand the complaints better as what you mention here is too brief to come to a conclusion. Post a thorough examination you may be asked for some basic urine and blood routine.  Medicines will be prescribed based on the provisional diagnosis. Rest assured. You should be fine soon. Hope I have answered your query. Let me know if I can assist you further.  Jay In Chat Doctor.  </s>