Can't shake cold?

My daughter had a bad cold for about 3 days but she's great now. I caught it from her but I can't seem to shake it. I've had it for almost a week now and it hasn't gotten any better. My nose is super congested, to the point where over the counter meds aren't really helping. I'm only sleeping a couple of hours a night because my nose plugs up and drains into my throat - causing me to wake up gagging. My kid didn't have it near as bad as me. Does anyone have any ideas or suggestions that may help me out? Any advice is much appreciated! Thanks!