Maygin,
I am so so sorry to hear about your spread. You must be so scared and frustrated. I am wondering if there is any place else that can do ketamine for you any sooner. I know some places have waiting lists but where I am numerous clinics that do them. Seems like there ought to something kind of close to you. There is a list of ketamine doctors (surely not comprehensive) at
http://crpspartnersinpain.com/?page_id=1436
Might they consider a lidocaine infusion sooner? There seem to be quite a few proponents for those on the forum. Also we had a recent post from GoodnPlenty about a good response to Nudexta. It is dextromethorphan with a quinine drug mixed in to enhance the dextromethorphan. It's expensive but GoodnPlenty seems to be doing well. Dextromethorphan is an NMDA antagonist like ketamine just not as efficient on its own. I hope you can get something new started soon!
Sending Healing Love and hopes for relief, Littlepaw