Welcome to EmpowHER and thanks for your question. So sorry to hear this. The symptoms of the flu shot can be;
Soreness, redness, or swelling where the shot was given, Fever (low grade),Aches,Toughness and itching where the shot was given. A more severe reaction can occur among persons with a severe allergy to eggs, because the viruses used in the influenza vaccine are grown in hens’ eggs. If the symptoms persist it's best to see your doctor.
Here are links that can help;