also, have you been tested for mrsa? you said you had a virus in your intestine- sometimes the bacteria that cause stomach issues can cause prurigo.
i have been getting strange red itchy bumps that are similar to blisters on my arms and the back of my neck for over a year now...i recently found out it is prurigo nodularis. but the symptoms sound similar...the bumps go away (for the most part, there is always a scar even if i leave them alone) and then come back somewhere else, or around the original infection. apparently they're untreatable for the most part, and stress makes them worse. wonderful.
I have the same thing except my started on my arms and like you have gotten more wide spread every day and more itchy. I went to the doctor and he thought it was a fungus, however, I have taken the medicine for a week and still getting more bumps. The first bumps have cleared up and more replace them in different spots.