Yep, what TJ says. You just gotta roll with it. The whole decongestant thing is a big money making scam for exactly the reasons he says. The more you use, the more you need, etc. Maybe a bit of olbas oil on your quilt cover or pillow if you’re trying to get to sleep. But forget over the counter stuff, it’s mostly bollocks.
Interestingly enough, I saw an advert for “european antibiotic awareness day” on the back of the Obsever magazine informing people that no amount of antibiotics will get rid of a cold. Nice touch…now tell that to the snuffling masses of lazy-arse dodgers lining up at my GP whenever I trot in for a (of course) genuine complaint.