SandraHi Jennifer,
My two youngest boys with CAH both got their flu shots. My 3 yr old got it last year too. My 10 month old just got his first dose last week and goes back in 30 days for his 2nd.
Doctors actually want people that hav any chronic health conditions to get the flu shot. I would say you have nothing to worry about if you decide to get it. Of course your doctor could discuss your concerns further.
Good luck
Sandra