All I can say is that ‘faith’ is believing what you cannot touch, see, hear or prove. And Jesus said Himself ‘blessed are those who have not seen but believe’. Most of my family either has cancer or have died of cancer. My neighbors think I’m nuts in believing there is a God. I say 'oh yes there is, and he loves us on both sides of eternity. Do you remember when you were a child and believed in Santa clause? Be like that about The Lord, just be childlike and believe. Look around you and see His gifts and blessings, like astounding sunsets, the smell of flowers, the love you feel for your spouse, or pet. That is God. Ask the Holy Spirit to give you the wisdom to recognize God and ask Saint Michael the archangel to protect you because it seems like the enemy is trying to make you doubtful. I will say a prayer for you too.