DD has allergies, so we're tissue users all year long thanks to her heavy post nasal drip and over production of snot and bogies and ickness. Her poor nose gets ever so sore and I have to admit basalm tissues with plenty of vaseline smoothed around the nostrils is a lifesaver, stops it getting too chapped and painful.
A cold is usually treated with honey and lemon for coughs, salt water gargle for sore throats, paracetamol for fevers, and if things get really rough we alternate paracetamol and ibuprofen. Only take time off if it's really zapping their energy and making them ill.
Flu, which I caught the year before last, needs an action plan as I am a single parent and oh boy did it knock me out:
Childproof one room (pre-illness), preferably the living room as it has the television and sofas.
Keep in a good stock of general medicines, I like to have in some cold and flu capsules, basalm tissues (wink wink), children's paracetamol and ibuprofen, cough sweets, honey lemon and glycerin, general cough medicine for all kinds of cough.
Keep cupboards well stocked with thinks like soups, cartons of juice (especially orange juice), and have some meals in the freezer ready to go so that if you get ill you can still feed the children without too much effort.
In better moments set up the sick room with blankets, pillows, plenty of DVDs, toys (quiet kind, so lego, books, dollies etc), snacks and drinks for the children, jug of water for the sick person to sip at etc.
If things are bad for a while, call on friends and family to give you some time out to rest, take the kids to school etc. I also keep a emergency fund, which in times like these is used to pay for taxis on school runs and extra internet deliveries of supplies for making life as easy as possible.
And then it's a case of just resting as much as you can, don't worry about the housework, keep meals simple, ask for support if you can and concentrate on getting better.