I know when one of my wisdom teeth in particular was bad I ate a lot of mashed potato and had soup. Might be worth a shot? Atleast they're nutritious!
Are you flushing the food out with a syringe of water or a medicated mouthwash? If you can get it I'd try rinsing with Corsodyl.
Hope the extractions go okay, you'll be fine I'm sure. Two of my wisdom teeth extractions were surgical and the teeth had to be quartered and cut out and jaw bone removed to do so. It sounds awful and it would have been considered a very difficult extraction but really it wasn't so bad at all - I just had it done under a local, the pain afterwards was actually relatively minimal considering, as was the swelling. I got a small bruise on the side of my face but nothing major! The stitches were the most annoying part.