The flu shot is very safe and I always get one each year and although the flu shot doesn't always stop the flu it does make the symptoms of the flu go away much sooner and makes me feel better.
It's best to get a flu shot before the start of the flu season so you can protect yourself from the flu.
The symptoms of the flu are, muscle aches, fever, chills, body aches, dehydration, fatigue, fever, flushing, loss of appetite, or sweating, congestion, runny nose, or sneezing, chest pressure, head congestion, headache, nausea, shortness of breath, sore throat, and swollen lymph nodes.
If you start noticing those symptoms of the flu you should take some flu medicine or even get prescribed Tamiflu which can help with the flu.
Wash your hands often in as hot of water you can stand with antibacterial soap to prevent the spread of germs.