I heard there is another strain of flu that isn't part of the flu vaccine. You may have that as I heard you have high temp with it.
For sore throat this never fails to work for me. It is a very old, old remedy, probably nearly 100 years old. I have it in an old medical book I have. Drink it often. The taste is not bad sort of a sweet and sour thing.
8 oz mug hot water, 1 tablespoon honey, 1 tablespoon vinegar. Mix well and drink. It will help keep you full of fluids and it really does help a sore throat. Whenever I or my husband get sore throats, I make up a 1/2 gallon pitcher of the stuff and just leave it in the fridge then heat it in a mug as I want it. Just remember to mix the pitcher up each time in case the honey settles.
Hope you get to feeling better real quick!