How can I save my dog's life?

I have a 12 year old American Pitbull (13 in April) who started having seizures less than a year ago (the first one we noticed was on June 18, 2010 at my high school graduation party). The seizures started off where he would just collapse and be still for about 5 minutes. That only happened about 2 or 3 times. Then after christmas 2010 he started having grand mal seizures where he'll be doing normal activities or playing then he'll stop and lay down and be still for about a minute then starts convulsing then he'll end up urinating himself and when the convulsions are over he'll lay in the urine for about five minutes or so. Since christmas they have been getting more and more frequent, to the point where he's having them about once a week, and my parents made an appointment to put him down this wednesday, 3/30/11. Is there any way putting him on a raw food diet (not the one you buy pre-made but actually giving him an uncooked chicken carc as opposed to his current commercial food) or anything like that could help him? its a waste of time for us to even TRY to put him on medication because he won't eat it, and even when we put it in the back of his mouth and try to make him swallow it, he still manages to hide it behind the trash can, and on top of it no one in my house would probably give it to him past day 3 (and i don't live there anymore). I don't want to lose Petey, he's my best friend, and he's pretty much my brother: we may as well have been born from the same mother. I really can't lose him. Is there anyway that I could tell my mom to try something that may help him and save his life? please help, i really can't stomach putting him down