It was flu shot day at work so I hustled over and got mine. I've had a ton of sinus congestion/grossness since Saturday. I've neti potted, huffed menthol crystals, guzzled water, steam showered, etc. It's mostly cleared up but seems to be moving into a chest cold. What are your best suggestions to keep it from settling in? I had pneumonia last fall and I would not like to repeat that.