Respected Sir, hi I evaluated your query thoroughly. Now so far as shaking is concerned if other etiology are evaluated in form of investigations needed it`s only idiopathic which means no reason no treatment. if certain investigations are done and you have reports you can consult in person in details. so far as coldness is concerned it`s tissue adaptivity to the external temperature giving rise to certain cramps which is individuality not major disease what at all you can do is protect your extremeties to some extent from major cold through wearing gloves or other measures and if exposed can immerse hands in leukwarm water for sometime to get immediate relief. hope this clears your query to some extent and will help you. thanks regards dear