Lots of drinks, keep your fluids up so any mucus can be removed easily. It's worse when it's sticky. I use steam aswell, it's time consuming and a bit annoying but put a bit of Vicks Vapour Rub in with the hot water and really breathe in deeply. Honey is great for a sore throat and I read somewhere gargling baby aspirin for a sore throat helps relieve the pain, but I haven't tried that.
I hope it passes quickly for you. This is my fourth cold since my BFP grr so annoying but will be worth it!!