It's itching me a lot, I don't know what to do anymore. I've taken some antihistamines and it's not making much of a difference; even the cream to reduce it isn't helping either.

Based on the description provided, it sounds like you may be experiencing a skin condition such as urticaria or eczema. It is recommended to continue applying cortisone cream to the affected area and consider trying a different antihistamine if the current one is not providing relief. If the symptoms persist, it would be best to consult a doctor for further evaluation and potentially stronger medication.