What antihistamines were given to the child with chickenpox to relieve…

What antihistamines were given to the child with chickenpox to relieve itching? I give Fenistil evenly, he's struggling, can't sleep, and didn't sleep normally at night. Is there anything else we could try besides Zyrtec? What helped others? Do you need to lower the temperature to 37 degrees Celsius with something like chickenpox? Should it be lowered if it is not high above 38? Did they take baths? Who knows, share your experience about chickenpox, how to help the little one ?