Hi. I'm On Holiday In Italy And Fell Down A

Hi. I'm on holiday in Italy and fell down a kerb 5 days ago hard on to my knee. There was extreme pain and the knee swelled and I felt nausea straight away but only lasted an hour or so but was limping badly for 4 days and now only slightly. However, there is more bruising now all around my knee, down my shin, on my calf, round the ankle and down both sides of the foot and the foot is swollen - but relatively little pain. I am flying home in about 13 hours. Is it safe to fly? I didn't get the injury checked at the time because the pain subsided fairly quickly. Thank you.