You might have the remedy in your spice cabinet now.
For your respiratory infection. Make a tea with 1 teaspoon of dried or 1 tablespoon of fresh thyme in 1 cup of water. Drink 1 to 4 cups of this tea a day.
This is also for acute respiratory infection.
It will also help the infected sinuses and lungs if you boil some thyme in water, then remove from burner and inhale the vapors.