Hi Mkal,
I am at day 6 of my upper jaw surgery. I was supposed to have Lower and chin as well, but everything fit in to place for me so well after they did the upper they let it be! For upper jaw surgery plan for about a 3-4 hour surgery. I will quickly share with you my recovery experience so far since we are in a similiar boat, however I did have my upper jaw moved more than 4mm.
My cheeks are very numb, as well as my nose and upper lip. The swelling isn't as bad as expected, but got continually worse until day 3.
I have awful headaches the first two days, and was using an ice pack on my head which helped. I then started taking sudafed and it made a world of difference. I am on pain medication (liquid vikadin) every 4 -5 hours, as well as a nasal spray and antiobiotics to prevent an infection.
Eating is the most difficult part. The first few days are the easiest but wow am i ready to eat some real food!!!
Expect a nose bleed for awhile as well. mine was non stop and finally ended the other day. I used tissue and let it stay in my nostrals to prevent creating a mess everywhere i go.
Hope this helps - GOODLUCk!