I no longer get the full on full-blown flu symptoms, but what I get is sneezing everyday (when I am under the weather) and then I feel very light headed and tired like you do with a flu. I have no raise in temperature or swollen glands. With aches and pains, I do sort of, but there not your typical aches that you get with a flu, I just find at night when I sleep I get strange sensations in my joints. I tend to now sleep too heavy on certain parts of my body (arms, shoulder) and then when I wake up those parts of my body, are sort of locked/stiff.
I don't think it is hay-fever, as I have no runny nose, itchy throat and watery eyes. I've never had hay fever before this CFS. Plus it's not hayfever season in Aus.
I too never get full-blown colds, but rather these symptoms when I am run down.