My lab work just came back positive for West Nile. The first 4 days my complaints were stomach ache, headache, and just not feeling well. Oh and my eyes hurt. Day 5 I broke out in a rash. Only reason I went to doc was on day 7 I had an occular migraine and swollen lymph gland in the back of my neck and head. Don't know if it prevalent where you live or not... but just something to think about.
edited to add: Those first few days I felt very depressed like sinking into a dark pit. I gathered up movies and took the sofa.