Friend, or friends discussed said panic attack on big tech social in DMs or something. Obviously, you follow your friends, you are likely to go out on Saturdays with them, maybe even your first name was mentioned in their messages, you are now tied to an advertising angle for ‘Panick Attacks’. Data brokers buy this information, serve ads. This is just ONE way the data may have been inferred. This doesn’t include contact scanning, location services and so on.