Intense Headaches and Passing Out from Flashing Lights: Is it Normal?

I'm not sure those are the right tags(?) to use, but I'm hoping they'll work, and someone who can help will see this. We're really sensitive to light, we know this, but we've met others who are also sensitive to light that have a different experience than us with flashing lights. They've said flashing lights hurt their eyes + can lead to mild headaches, and that's it? Flashing lights give us really intense headaches and usually lead to us passing out. We don't think we've ever had a seizure, but we also know we've been told we can twitch after passing out, nothing serious we think, just some usual twitching of the arms and legs. We think it's nothing serious because no one has ever called any emergency lines when it has happened besides once, but we think it was more them freaking out from us passing out than from the twitching. Is this simply a situation of people experiencing something differently from each other, or is there a chance anyone knows why this happens to us and not them? We aren't looking for a diagnosis, just some help figuring out if this is something else from light sensitivity and/or something we may need to worry about and go to a doctor for or if this is normal so we do not have to worry