Hello dear Greetings Regarding your symptoms of sore itchy nipple and random chest pain yes you need to show concern I am suggesting that you following differential diagnosis Mastitis Breast carcinoma Breast abscess Bacteria skin infection(nipple) Acute chest syndrome In view of this please do a breast scan to rule out this conditions and see a surgeon specialist with the result for further expect clinical assessment and adequate drug prescription Meanwhile the experience of shaky hands and arms I am sure they are not related to the above conditions but rather a possible condition as follows myopathy Spinal cord lesion Encephalopathy So please see a neurologist for expert management I hope this helps