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You are experiencing these symptoms due to vasospasm of the small arteries of the hand . This can occur in Raynaud's phenomenon.
Other causes could be blockage of any other vessel above and needs Doppler study e.g a cervical rib pressing the brachial artery.
You must show it to a doctor and if no secondary cause is there treat Raynaud's phenomenon with nifedipine, prazosin, losartan etc.