Is there a doctor in the audience?

I'm suddenly suspicious of this flu-like bug I have developed. Mostly because my beestung finger from last Monday swelled up again a couple of days ago and has been red, swollen and itchy ever since. And I just realised that it's been doing that since I got sick.

So I'm wondering: could that just be a side affect of whatever bug I have, or are the flu-like symptoms maybe a delayed reaction to the bee sting? Is that even possible? It would certainly explain why I can't think of anyone I've been in contact with who I might have caught this off, and also why no one else around me has come down with it.