Hi..
Thanks for the query..
Severe itching all over the body seems to be most probably due to
allergic reaction causing
Allergic Dermatitis..
It can be due to a number of causes like any any foods or medications, skin cosmetics, soaps, detergents, leather, latex, poison ivy, bug bites etc..
I would suggest you to consult an Emergency room and get evaluated and a thorough clinical evaluation and investigations like allergic tests like
Patch test, RAST test, food challenge test etc can help in diagnosis and treatment can be done accordingly..
The tests will help in ruling out the exact cause of the allergen and once you know the cause of the allergic reaction you can avoid exposure to it to prevent allergy attack..
The Physician can advise to oral anti allergics as well as injectable steroids for relief..
For now Yes, you can take anti-allergics like Benadryl to control the itching..
Do cool compresses..
Application of calamine lotion can help in soothing the skin..
You can also be instilled an
Immunotherapy that will help in reducing the severity and frequency of allergic attack..
Hope this helps..
Regards..