Why can't we get a flu shot!?

Every year the governmental agencies that are 'in charge' of such issues post warnings that we should all have a flu vaccination. However, upon seeking such vaccinations, I have been repeatedly refused care! I have 2 children and neither has ever had a flu shot and I cannot even obtain one for myself, even though I have an auto immune disease and subsequently undergo immune altering therapy routinely. Is this just a load of **** the government is feeding us to get us worried or what? This year's vaccine report says there is enough to go around but we are still getting a runaround! I am more than a little concerned here.