I hope you get better soon. Don't push yourself and have rest so that you recover and don't relapse.
The onion remedy may be effective, but I don't know if I would like to stay with the taste of onion, stuffy nose, and feeling sick;) I would tell you better to make a very strong ginger tea and add honey, some people add a clove of garlic too. And that soothes the throat. Take care!