Sai,
in addition to the pain meds, antipsychotic and anti-anxiety medications may help with the the altzheimer's distress. You will need to be very sure that the doctors are aware of all the perscriptions being given. The medications that Christine has suggested can make a huge difference as to whether his last days are comfortable and peace or a nightmare.
My best wishes to you and all of your family.
Maria


CG to husband - SCC Tonsil T1N2M0 HPV+ Never Smoker
First symptoms 7/2010, DX 12/2010
TX 40 IRMT (1.8 gy) + 10 Cetuximab
PET Scans 6/2011 + 3/2012 clear, 5 year physical exam clear; chest CT's clear of cancer. On thyroid pills. Life is good.