I had orthodontic surgery to correct my bite about 20 years ago. I had already had braces as a teenagers, but my jaw was underdeveloped, so they didn't do much good.

I had 3 lots of surgery. One surgery involved cutting through my lower jaw bones, bringing my jaw forward and bolting it in place. A second (or first - I cant remember the order) surgery involved cutting through my upper jaw between my 2 front teeth and widening the upper jaw. I had a thingy in my mouth that needed daily widening - excruciating pain. They started it in surgery and then I had to do it myself. Eventually I could fit my index finger between my 2 front teeth. I then had braces to close the gap.

The 3rd surgery was to remove the bolts and remove my wisdom teeth. This was my preference as I found the bolts painful.

I can't remember how long the process took. It was over a couple of years I think. It made a big difference to the pain I had in my jaw when eating. It also made a big difference aesthetically. For me, it was worth it. I had a huge overbite though.

It's worth getting a second opinion for things like this. I imagine techniques have changed over the years, so you may not need all that surgery.