pancreatic cancer itself has worse prognosis. your patient is in terminal stage as you have mentioned. palliative care are the best option in this case and he is on that se up. drastic treatment is not necessary. infection may occur and can be managed with specific treatment but main goal is to maintain the quality of life. oral drugs are preferred than intravenous injections. I do not no what drugs has been prescribed to him. nausea
vomitting may be a side effect of other drugs. consult with your doctors.