Hot tea with honey and lemon. For the allergies, get a neti pot or boogie bottle and rinse your nasal passages, gets all that mucus, pollen and whatever else flushed out, also will help any post nasal drip that might be contributing to a sore throat.
Salt water to gargle with and local honey by the spoonful to help with allergies and soothe your throat. Maybe sinus rinsing with a neti pot. I hope you feel better