RAH, I had a nasty cold a little while ago and what helped my congestion in the lungs was Mucinex Maximum Strength tablets - one every 12 hrs. I'd only take that for daytime, I'd use Robitussin Maximum Strength Cough and Chest Congestion DM. Both over the counter, but both worked very well. It loosened up the congestion so I could get it out and let me sleep at night.
I didn't get a shot, and the doc said I just had a bad cold, not the flu.