I got a really bad cold the first week I started T. I thought it was the same thing as what you're talking about but decided it wasn't when I got infections and a bad cough several days to a week later. Ended up spraining my ribs the cough was so bad. 4-5 weeks later and they're still healing *sigh* haven't been able to do more than biking at the gym for this whole time. I digress lol. It really depends on if you actually caught a virus or if it's as you say it is. Hopefully it'll be gone before a week, two weeks max. That would be my best guess. But of course, you never know since everyone's body is different. I'd treat it like an actual cold or flu though, just in case.