What KIND of sore throat? There are 3 kinds
1. One that feels like you are swallowing lit matches, that horrible BURN...
2. One that feels scratchy, like light sandpaper
3. One that feels like your throat has a bruise in it.
IF it's #2, I was getting one like that that would last about 4 days then go away, then come back in about a week and last 10 days, go away for a few weeks, come back, go away... FINALLY I remembered that I didn't have our duct work professionally cleaned in years... I had them come, they cleaned out all the duct work in the house and the throat problem never came back. Another time it was happening I remembered I didn't clean the furnace filter in 6 months! (Supposed to be done once a month) - yours may be worse because it's affecting your nose too, and of course if doesn't have to be your furnace filter, but I mean it sounds allergy related. How do you feel physically with it?