When will pain management doc write for a pain pump since I have tried everything else and and nothing has worked?

Maybe never. Pain pumps are for individuals who respond to opioids but are having severe side effects due to escalating doses. Not everyone will benefit from a pump, so a trial will have to be done. Ideally this would require weaning off of all oral pain meds. There are long term complications with pumps so do your homework. I would also inquire about a spinal cord stimulator is not already tried.
JUST ASK. Not all pain managment docs implant pain pumps. It is worth asking your doctor about your options, including use of the pain pump.