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High stress can sometimes trigger certain common cold symptoms even in the absence of an active viral infection. Unless the virus has actually been cultured you can't be certain what's happening in your body.

I do a lot of scuba diving. There are many anecdotal reports of divers who briefly experience cold / flu symptoms after failing to decompress correctly. The popular hypothesis is that tiny bubbles in the bloodstream trigger an inflammatory immune response, but who knows?

We literally just discovered a new muscle in the jaw. It isn't a feeling that you have, it is a fact.

The same thing happens to me. But it doesn't have to be a virus, it may be bacteria living in our body and waiting for a moment when our immune system weakens (like after prolonged stress). It's been known for a while our body is crawling with some bad boys, like Staphylococcus aureus for example.