Then again that's telling nothing.
You most probably just have the common cold. That won't show up in the influenza test.
The second most probable cause for your symptoms is you are just freaking out. I have seen guys get their lymph nodes swell up just because they were sure they got HIV.
Let me venture a wild guess. You are pretty inexperienced sexually, right? Was that your first time with a girl?
My diagnosis is Christain guilt complex.
Unfortunately, it's fatal.