My hubby has severe itching all day/night. Scabies test neg. CBC normal. Going on 8 weeks. Hydroxyzine & Benadryl (diphenhydramine) no help. No other sympts. Has rash

See derm. See dermatologist since there are many causes for itching. In the meanwhile, be sure to apply a moisturizer immediately after bathing to see if this helps since dry skin is by far the most common cause for itching. On the other hand, the rash needs to be examined even though it may come from repeated scratching.