I have an itchy rash all over my body except my face for a week. had blood test done to see my white cell count. no fever, but upset tummy and fatigue?

Not enough info: A detailed history and visualization of your skin rashes are needed for proper diagnosis and treatment. By your description, it looks like your skin rashes were there for sometimes but i don't have info on how long the other symptoms are. Those might associate or are different entities and have different diagnosis and treatment. You should make an appointment to see a doctor for proper care.