I think you'll look great once the swelling goes down which can take a looong time. I had BSSO plus LeFort 1 plus genio 3 weeks ago and the doctor warned me beforehand that the LeFort area will be swollen for much longer than the mandible area, and I am glad he did, otherwise I would have panicked too. My upper lip and the whole area surrounding the nose is still very swollen and looks 'bigger' than the lower jaw area, but I can clearly see and feel (I did not lose feeling) that it is swelling, and this is after 3 weeks.
For now just concentrate on keeping the lips moist all the time by applying some balm or ointment constantly, try to keep your mouth clean inside as much as you can (I have been using syringes with salt water in addition to gentle brushing and mouth wash etc.), keep up your calorie intake and watch comedies on Netflix (word of warning: laughing hurts!
). Good luck and hope you'll feel better soon.