If it were me, I would take at least some of the oleander and colloidal silver rectally (such as via a rectal syringe or a therapeutic enema), starting small and working my way up. Not only will that give you great absorption, it will also send the absorbed oleander and colloidal silver directly to the liver.
I believe that it is absolutely critical to also steps to cleanse the liver as well as keep the bile ducts open and flowing to help get rid of the toxins from die-off. Otherwise, your already-impaired liver could be overwhelmed.