Hello. welcome. sorry you are feeling so badly. Do you have a rash or just itching? When the whole body itches, it might be pruitus. https://www.mayoclinic.org/diseases-conditions/itchy-skin/symptoms-causes/syc-20355006 That you are also nauseated begs the question of your having an allergic reaction of some sort. I would encourage you to see your doctor or go to an urgent care as soon as possible.