Hi Sai, please feel free to post absolutely anything. Everyone here is affected by cancer in someway and is just trying to share their experience and help others in whatever possible means.
As discussed over phone, go for Fentanyl patch and also discuss with a good oncologist rather than a general physician about the situation.
You can read about Last days of life here:
http://www.cancer.gov/cancertopics/pdq/supportivecare/lasthours/patient