1. stop eating. because food complicates things and slow your body down / take energy away from fighting the viruses, and will prolong your illness. if you do eat, try staying away from animal protein, especially cooked - and eat mainly fresh stuff like salads.
2. best army you can recruit to fight off the invading viruses. 2 big glasses a day should be good:
• large portions of fresh vegetable (green) juice - celery, cabage, sprouts, cucumber, anything green. also tomatoes if you like, tastes yummy. (fruit juices are also good, but not nearly as powerful)
(i worked out a deal with local juice place, and i bring vegetables for them to juice, and i pay a couple of euros for the drink. i do this on the regular, keeps immune system strong. you can ofcourse invest in a good juicer, but it costs 300+ euros (the cheap ones are not worth bothering with), and is a bitch to clean)
• as much raw garlic juiced as you can handle. for me an entire head (12 pieces or so) tends to upset my stomach - not to mention make the drink taste TERRIBLE (so i usually do half a head or about 6 pieces)
• lemon juice - acts as anti-oxident.
• some pieces of ginger, also juiced.
works wonders. if you do this at the beginning of a cold you're likely to be better the next day.
3. a netty pot is the best thing for congested sinuses.
4. also if you can get to a sauna the sweating can be of limited help.