Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that itching over the scalp and body can be due to a number of causes like
Contact Dermatitis or allwry reaction caused by any skin and hair cosmetic, allergies to any food or medication, extremely dry skin,
fungal infection,
Psoriasis etc..
Consult a Dermatologist and get evaluated and he can also advise you to get investigations done like Blood tests, microscopic examination of scraping from scalp and skin etc..
Treatment of the underlying cause can resolve the problem..
As of now you can take
anti histamines like Benadryl or Levocetrizine to relieve itching..
Use emmolients to lubricate the skin..
You can also be advised Steroid lotions and ointments, Antibiotic ointment, immunosuppressants and anti histamines..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.