A bit of clarification. I read what people write. In detailing your experience you say, "I swallowed a small amount of water."
Later you mention that you were drinking a lot of water, taking Mucinex, hot tea, rest and a vaporizer. If you did this because you had the flu...that would be
a reasonable response. However, you described these steps as your response to, "swallowing a small amount of water". Sorry, but I do consider that to be a gross overreaction in that instance. With the passage of time it does seem you were having the onset of the flu and the aspiration was coincidental.
Please overlook my poor choice of wording and welcome to the world of diving. It has the ability to change your life in untold ways. Feel better soon and safe diving.