Suggest Treatment For Itching All Over The Body

Hi,
I am suffering from a ridiculous skin problem.From the past year the problem started. At the time of rainy season after taking a bath or after sweating in perspiration, tremendous amount of itching of whole body is occuring. It is continuing for 30 to 45 minutes and it is so tremendous in nature that I am loosing my temper and wearing a shirt in the scorching heat in the hope of recovering or get a temporary relief. No external symptom is occuring and my local skin doctor has tried scabiped and many types of tablets but all are in vain. The itching becomes unbearable after taking bath or sweating. Even now I can not sleep properly for this problem. Please help me. Previous year, after the rainy season passed, it had abated substantially. But now it is terrible. I have consulte many doctors but ll in vain. Please help me.......