I had a terrible throat a few weeks ago, and my voice just couldn't cope with the singing, it effected my breathing too, catching me out and making my eyes water. However, VOCALZONES are brilliant, and got me through. Also - continuously sipping water was essential! (I suppose we should be doing that anyway!) My voice took weeks to get back to normal, and you have to be patient or you will strain it.
One of the suggestions I had was gargling with vinegar.... cider I think! Yuk! And that awful cough medicine, gargle till you heave... I didn't try it!
And honey and lemon is soothing, you can make it and sip it after it goes cold!