Sorry to hear you are unwell! If you have made it this far on program, keep going, you are closing in on the end of the virus (with any luck!!). Have you tried boiling up ginger root tea? It has good anti-inflammatory and anti-bacterial properties (peel ginger root - about 1/4 inch, and slice thinly - place in tea pot and fill with boiling water. If you need it sweetened, use splenda). If you have a hard time with it on its own, mix it with another herbal tea. How about a netti pot? Probably would help with the drainage that may be inducing the coughing from sinus drainage. There are stevia sweetened cough drops at the health food store (Canada) - they are called ...hmm, I just checked the cupboard and don't have any, there are also Halls that are sugar free. Both are not necessarily on program but hopefully won't throw you off program.
Anyway, just a few thoughts that you may have already tried. When it doubt, can't go wrong with a raw onion (anti-viral, antibacterial) coupled with some cabbage, garlic, celery stir-fried and added to chicken broth and boiled diced turnip for some veggie vitamin infusion.
Feel well soon!