I am not clear as to why you went to a fat free diet. To solve a problem or for general health?
No one should havea fat free diet, in fact the gallbladder/liver stagnates on a fat free diet because it isn't purging bile in response to fat in the diet. Plus you need fat for proper brain functioning etc...
I would do a series of Liver Flushes before hacking out your organs. I guess it being 8 days ago you might have already had the gallbladder removed.
Anyway, ask your doctor/surgeon if you should do a Liver Flush first before resorting to surgery - not to take his advice, but to understand the reasons why your surgeon is incapable of telling you to do a liver flush.