My dad has terminal late stage metastatic prostate cancer and had stopped eating and fell to about 115lb. 3-4 ensures a day is what turned him around. There is also an old anti-depression med (don’t remember the name) that caused users to get fat because it increased appetite, the md should know. good luck.
It took my dad a couple weeks ago. Last doctor visit before contacting home hospice our doctor told him it had spread everywhere. I suspect even his brain at that point. He lost all will or appetite too eat and in the last three-four days his ability to even safely drink.
My prayers too anyone and their family fighting cancer. For months years actually our prayers was for healing. He outlived the initial prognoses the doctors gave him by over 8 years. The last couple of weeks prayers were for his release from the torment cancer brings it's host.
The hurting when skin is being touched is normal as nerve endings are extra sensitive as is the person with cancer trying to their remove sheets, clothing, etc. GOD be with both of you and your families.
Praying for your Dad.