Hi Lolo,
I cant help with your keto problems but you can try massage and Noogleberry to build things back up.
Here are two of my favorite links
http://www.breastnexus.com/showthread.php?tid=25391
http://www.breastnexus.com/showthread.php?tid=26280
I dont know how BO would react with your situation but it normally does a too good job of adding fat.
This is a good thread for using BO
http://www.breastnexus.com/showthread.php?tid=27368
I have recently discovered using BO as a nipple cream and am really happy with the results so far.
It seems to be doing a great job of adding fat to my breasts by absorbing the BO through the soft tissue around the nipple.
I dont have the thread but search for 'DIY boobie or Nipple cream'. SweetOrange's thread is the one I'm using.
Good luck and have a happy New Year.
Bobbi