Thanks for all these additional information.
I understand your concern.
Well as you describe,possibly it's mild walnut allergy and not serious as you had eaten large amount.
It's good to take OTC Claritin.
And apply calamine lotion/1% hydrocortisone cream on affected area.
You should avoid eating nuts in large amount.
Making sure you use a fragrance-free moisturizer, and don't have your shower or bath water too hot, and drinking plenty of water to hydrate from the inside out will also help.
Generalised pruritis without a rash is a systemic disease in about 50 percent of people. and can be caused due to various causes like iron deficiency, liver disease, kidney disease, and hyper or hypothyroidism, urticaria, particularly dermatographism and systemic forms of contact dermatitis can cause generalised pruritis, even if no rash is visible.
Further tests include CBC, LFTs, Chem 7, thyroid function, iron studies, stool studies for parasites can be done in case of persistent itching.
Having said this,if your symptoms'll persist then see your doctor for further evaluation and management.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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