welcome to healthcare magic forum
it look like you have some allergic pruritus
over body .as you feel cold and shiver you need to do blood test
to rule out infection as it may be cause of the itching .
dryness of skin ,thyroid disorder
may cause itching ,so let me know if you have some disease or not
apply good moisturizer over body ,drink more water .
avoid direct sun exposure ,very hot water bath and harsh soap .
you can take anti histaminic tab for itching
better to consult dermatologist
i hope i answered your question