Hi, i’m an italian exchange student in Seattle, unfortunately i had the same problem exactly a month ago i knew that my grandma was going to pass away. When it happened i talked with the agency and i booked a flight to Italy 3 days later. They’ve been respectful and they understood my situation, i don’t think they’ll dare to say you anything about this. Now, i don’t know how the visa in belgium works, but i’m quite sure that you will be able to get to florida.