I am so sorry to hear of your loss. Recently I lost my dear mother, and found great comfort in the Holy Bible, like at Isaiah 25 verse 8 - "The Sovereign Lord will swallow up death forever, and wipe away the tears from all faces." Also at Revelation 21 verse 4 we find the promise that God will remove both pain and death. I hope these verses give you a measure of comfort during your time of grief.