I personally see them as such: 'Shiver' is a physical bodily movement as a result of cold or fear. Usually describing a brief, light reaction, rather than an immense reaction. " 'Stir' is the buildup of some immense feeling which is believed to originate from the gut, it is either some kind of anger or excitement (not for fear or joy).
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AhmedsMsre, my dear friend , thank you very muchYou are welcome Ahmeds