Without knowing the cause of your sore throat, there are a couple of posts he did that may offer some relief.

https://steemit.com/gardening/@krnel/getting-to-know-herbs-malva-mallow

https://steemit.com/gardening/@krnel/getting-to-know-herbs-goldenseal

https://steemit.com/gardening/@krnel/getting-to-know-herbs-elecampane

I also swear by oregano oil. I use a brand called oreganol, putting 4-6 drops in capsules you can buy at health food stores.