The number one idea for help during sick days is being prepared before you are sick. Stock up for over the counter remedies you use, perhaps it being acetaminophen, nausea syrup, thermometer, Epsom salts, cold and flu medication, sinus medication, anti diarrhea, heating pad and anything else you can think of. You don't want to have to run to the store to buy these things once you are already sick, that alone will bring a great source of help to those days.
Also stock up on food items that help when you're sick. Try to have homemade chicken soup frozen that can simply be re-heated. Have your supply of saltine crackers, jello, ginger ale and anything else that you tend to eat when ill or just getting over something.
Try also getting some essential oils in eucalyptus, rosemary and peppermint. On those sick days, sometimes soaking in a bathtub with a few drops of those essential oils helps to bring relief. Try also simmering a few drops of the oils in a low simmer pot, or a couple drops on a lightbulb ring. You can also tie some fresh eucalyptus to a shower head that also brings a nice touch to a shower.
Make a rice bag sachet. Take a silky or other soft touch fabric and fill it with rice, and perhaps a some lavender flower heads as well. On sick days, zap it in the microwave a few seconds and place it for warmth on any sore muscles, joints, or your neck. The lavender scent is soothing. You can also drop a few drops of lavender essential oil on the fabric itself it you'd like.
Get one of those cold/ice pack masks. Those can also feel very soothing around your eyes at times.
A foot bath is very soothing too, simply soak your feet in warm water with some Epsom salts and a couple drops of essential oil. See if you can find a loved one to rub your feet for an extra special touch.
Stock up on some good books or movies, nothing too heavy; try for light hearted topics where you really don't need to concentrate much.
Get plenty of rest, lots of fluids and vitamins. Turn your phones off if you can. Take the time you need to recover. When we're run down and sick, pushing harder many times just delays the healing process.