Skin, scalp inflammation and hair fall.

Have been experiencing severe itching all over my body for the past 7 years, along with progressive hair loss from different parts of my body. The itching and a crawling or stinging sensation, similar to ants biting, are triggered by several things, especially exposure to sunlight, exercise, an increase in body temperature, after bathing, and often in the morning after waking up. Certain foods and drinks also seem to trigger my symptoms, including spicy food, sweet drinks, eggplant, bananas, and oranges. I am also experiencing hair loss from almost all areas of my body, including my scalp, eyebrows, beard, moustache, chest, arms, and legs. The hair loss appears in small patches. Some hairs seem to become white or abnormal near the root and then fall out. I feel as if the hair roots are becoming weak or damaged. I also have persistent itching on my scalp. I have used ketoconazole shampoo, but it has not completely relieved the scalp itching. I have had blood tests done previously, but t