I got flu shot thursday afternoon and now i feel like coming down with something, i've been paranoid about getting flu since thursday could be anxity?

Side effect is: possible. Flu shot side effects may include: slight swelling, redness or pain at vaccination site. If headache, nausea, fever or muscular pain occur they usually resolve within one to two days. You won't get the flu from a flu shot because the virus either contains inactivated virus or doesn't have virus particles in it. Severe side effects are rare.