Chicken pox advice

Rachel

Needing some help ladies! My son had a fever and appeared unwel last Thursday with cold like symptoms, on the Sunday he came out with chickenpox which explains the fever however it’s Tuesday night, he’s covered in blisters and temp is still reaching 39.4! He’s so uncomfortable and it’s heartbreaking to watch! He’s hardly sleeping and his mouth is covered so obviously he’s not wanting to eat (he’s still having wet nappies as I’m managing to get fluids into him) Any tips? Is it normal to have a fever for 6 days??