Hi there!! I am Dr Jigar (Infectious disease specialist). Let me answer your concern. Chicken pox is a viral infection that causes rash and spots on body. It is common in children but adults do get it. When adults get it, it is a matter of concern as complication are higher in infected adults. Now in your case it appears that you have started proper drug but little late. Sensations that you are getting are common and you need not to worry about it. Ensure you maintain hydration( drink plenty of fluids) & apply soothing emollient creams on affected areas. Antihistaminic tablets will also help you for relief of these symptoms. I think you will be all right in few days. Take care & we are here to help you. Dr Jigar ID specialist