Gastroenteritis is going around. It's usually caused by a stomach virus. If you are having vomitting and diarrhea, the most important thing is to keep up with your fluids and avoid dehydration.
Here are some suggestions:
 You should drink something every time you have an episode of vomiting or diarrhea. Take small slow sips of a cup Pedialyte or  Gatorade. You might also try drinking clear soda, such as 7UP or Sprite; clear broths; or non-caffeinated sports drinks, such as Gatorade. Affected adults should try to drink plenty of liquid every day, taking small, frequent sips.
 Ease back into eating. Gradually begin to eat bland, easy-to-digest foods such as soda crackers, toast, gelatin, bananas, rice and chicken. Stop eating if your nausea returns. 
 Try the BRATTY diet: Small amounts of Bananas, Rice, Apples / apple sauce, Tea, Toast, or Yogurt
 Avoid certain foods and substances until you feel better. These include dairy products, caffeine, alcohol, nicotine, and fatty or highly seasoned foods.
Adapted from the Mayo Clinic.

Protect yourself from the flu, wash your hands often with soap, and try to avoid putting your hands to your face.
Have you had your flu shot?

All the best for the new year! Any New Year's resolutions? 
Think of one small achievable thing, that if you stuck to it, would make a big difference in your life. Try and do that one thing consistently for January. If you succeed at that, you have created a new healthy amazing habit that has changed your life for the better. Next select and try to stick to one more small important thing for February.
Trying to change a lot of things at the same time is not usually successful. A long list of New Year's resolutions may make you feel overwhelmed and you are less likely to stick to them.
What ONE thing do you want to change for January?