There was a case where a person had a rash all over their body after the flu shot. It was quite alarming. However, after consulting a doctor, they found out that it was a mild allergic reaction. The doctor prescribed some anti - histamines and the rash disappeared within a few days. This shows that while there can be unexpected reactions, medical help can usually sort things out.
A friend of mine once had a flu shot and then felt extremely fatigued for a week. She was scared that something was seriously wrong. But actually, fatigue can be a normal side effect, especially for those with a weaker immune system. It took some time for her body to adjust and build immunity. She started feeling better after getting enough sleep and eating well.
I heard of someone who had a high fever after getting a flu shot. They were really worried as it was unexpected. But it turned out that in some rare cases, the body's immune response can cause a fever as it is fighting off the antigens from the vaccine. It subsided after a couple of days with proper rest and taking over - the - counter fever reducers.