You know a common side effect of the vaccine is a milder case of the flu, right?
See what Aychamo said. You dont get the flu from the flu vaccine. These are your options:
1. Symptoms such as low grade fever, inflammation etc related to a stimulated immune response (ie the flu shot working).
2. Flu like symptoms as a result of psychosommatic (ie self inflicted/imagined) tendencies
3. You were already sick and you got the shot during incubation. Or you get sick in the two weeks after receiving the shot that it takes for your body to create the requisite levels of Tcells to make sufficient immunity.
4. No reaction.
5. Allergic reaction related to vaccine components (ie if you have for example an extreme allergy to eggs).
6. Encephalopathy in EXTREMELY rare cases which could never, under any circumstances, be mistaken for the flu. Which is currently understood to be the result of genetic predisposition whether mitochondrial or chromosomal mutation related.
There aren't any other options. You do not. Get. The Flu. From the Flu Shot.
Viruses need their genetic material to be virulent (infectious) and ergo reproduce themselves in your body. The flu vaccine contains only protein coats of viruses so that your body can form the appropriate killer T cells to recognize and destroy the infection before your system is temporarily overwhemed (I won't go into the mechanics of receptors/binding sites). The flu vaccine does not contain live viruses containing both of the things that make a virus - protein coat plus DNA/RNA. The flu vaccine contains no DNA/RNA. Without DNA/RNA it is literally physically impossible to become infected with the flu.
End. Of. Story. Please. Stop. With. The. Bad. Information. Its. Annoying.