Make sure you share with your doctor the whole story of what happened when you see him.
As for the turning blue and not breathing... My younger brother did that when we were little. Not in response to a febrile seizure but as a response to pain.
From what you said, I would have thought it more likely that the baby was choking on something (possibly the swollen tongue) or having an allergic reaction to something. I wouldn not have thought febrile seizure BUT I am NOT a doctor just a Mom who has seen a lot between my 3 kids, 3 siblings and 3 little cousins who are now my parents wards (and just a few years older than my own kids). BUT just because I haven't heard about it doesn't mean it isn't true. It just means I get to learn something new.
The tongue swelling was what made me think allergy. That is something that goes along with anaphylactic shock or sometimes slightly less severe reactions than anaphylactic shock. Also, the not breathing can go along with a severe reaction such as anaphylactic shock. But it doesn't sound like your child was treated for that at all which makes me hesitant about it being an allergy.
Anyhow, what I know about febrile seizures is that they occur when your child's temperature shoots up very quickly to a very high temperature. According to the doctor at Children's Hospital who I spoke to, the are usually harmless and don't cause brain damage like other seizures. Once they occur you can usually expect that it is more likely for them to happen again, so you have to watch fevers a little more closely with a child who suffers from them. Also, they usually outgrow them by age 5. My cousin had febrile seizures. Plus I asked about them 3 weeeks ago when my son was at Children's and had a temperture of 104.4.
Anyhow, I hope that this helps you out. My best advice is to talk to your doctors and explain your concerns. They should be able to tell you all that you need to know. If they don't have the answer, ask for a recommendation of someone who can help you. If they doctor can't recommend someone, call you insurance company for a referral. Good luck.