I was bit by something yesterday on my back. I felt the bite happen and said ouch ! About 15 minutes later it was a red welt/bump..,,didn t itch just red. I forgot about it and then today woke up with chills and nausea, and my skin is covered in a rash that makes me look sunburned and my skin is hot to the touch. The redness goes from my upper thighs all the way up to my face. No breathing problems. Other than skin sensitivity and nausea I m fine. No fever. Any idea what this could be? Benadryl doesn t seem to work...takes the sunburn feel away but I m still red.