I hear you on the sinuses thing...just got over mine and I ended up with a scratchy voice too.
A few home remedies I used were:
Hot Drinks - Lemonade or Ice Tea mix in hot water is great. When you drink it the steam opens you up, and the hot liquid really opens up and clears out any of the drainage that has gone into your throat or chest. Its great.
Hot Water Bottle - if your having bad headaches with your sinsus, try laying the sore part of your head on a hot water bottle. Make sure to not make it too hot, but you want it quite warm. Just lay on that for about a half hour and it will calm it down, and probably put you to sleep (that's why you don't want it warm
Warm Compresses - Just take facecloths or towels or whatever, run them in some warm water (warm as you can take) and just place them over your nose and cheeks and leave it there until it becomes cold again. You can do this as much as you'd like.
I don't personally suggest the steam idea in the shower since I find I end up feeling congested and start coughing alot, but some people swear by it. Usually its a trial and error type of thing.
The best part of all the things listed above, there is no harm using these over and over again. Worst thing that'll happen is frequent poddy trips from drinking alot of Tea or Lemonade. That's the worst of it.