having had RSV twice I have suggestions that should help.
Drink way more water than you think you need. It moistens and losens that phlegm you are coughing. I learned the hard way by that stuff being so thick that I literally coughed blood trying to get it out.
Second thing, and this was more distrubing. Sleep!!! This knocks the hell out of RSV. Not an hour or so more. I slept 18-20 hours straight for 3 damned days. I was exhausted anyway but man did it knock the RSV down. In recovery now I still find I fall asleep easily after eating and will sleep as a surprise two or three hours in the middle of the day. You may also find you have no appetite. I went for 3 days without eating and finally forced myself to eat a little.
I say all this having spent nights coughing to the point that my ribs hurt. I am over 70 so your mileage may vary. This stuff is nothing to fool with. Wheezing harder than Darth Vader night after night is no picnic.
Give yourself good care!!!