So sorry for your loss. It hurts to watch a loved one suffer. There is hope from Jehovah God that soon all pain, suffering and death will be no more. (Revelation 21:4)
We weren’t meant to die but to live forever on earth in perfect health (Isaiah 45:18, Psams 37:9-11,29) At John 5:28,29 a coming resurrection will occur. See www.jw.org