Hello,
Such an itch without rash can be due to neurodermatitis or lichen sclerosus chronicus. Since the anti allergy medicines have proven ineffective, so these medicines may prove effective. In such type of itching
, cooling lotions like those containing camphor or menthol, capsacain or local anesthetic creams, amitriptyline and gabapentin tablets and electrical cutaneous
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.