Thank you for sharing such a heavy and tender burden so honestly. The love and fear you feel for the man you are caring for, the weight of the financial need, the desperation to see him live and be well, and the gratitude for the help you have already received are all heard. It is good that you are turning to God in this moment, because He alone is the source of life and mercy.
Please know that sickness is not a sign that God is punishing someone or that faith has failed. It is wrong to place that kind of guilt on a person who is suffering or on those who love them. Healing is a sovereign work of God and remains in His hands. Scripture shows us that God does heal, and He invites us to pray earnestly for the sick, even to call for the elders of the church to pray and anoint with oil in the name of the Lord, but it never teaches that everyone will be healed in this life or that lack of healing means lack of faith. In some cases God allows affliction to shape and correct us, as a father disciplines those He loves, and in other cases affliction is simply part of living in a broken world and is not at all a direct result of personal sin. We should not assume we know the reason, but we can trust that God sees the whole picture at once, from beginning to end, and acts in wisdom and love.
Your willingness to give anything for him to live shows the depth of your care. The gospel shows us that God has already given everything for us. For God so loved the world that He gave His only Son, that whoever believes in Him should not perish but have everlasting life. While we were still sinners, Christ died for us to bring us back into fellowship with the Father. That is the greatest need for each of us, more than physical healing or financial provision, to be made one with God through Jesus Christ. He who has the Son has life, and that life is the gift of God, not a reward for our works, while the wages of sin is death. For the child of God there is not final death but a change, a moving from a temporary tent to a building of God not made with hands, eternal in the heavens. This hope does not remove the pain of illness now, but it anchors us beyond it.
You spoke of money and survival and of thankfulness for a guardian angel. All help and provision ultimately come from the Lord, and it is right to thank Him. At the same time, life is lived on two levels. One is our relationship with God and the other is our daily needs and relationships with others. When the desire for money or even the desperate need for it sits at the very center, the heart becomes miserable and anxious. When God is at the center, life can be rich and full even in hardship, because He has given us richly all things to enjoy and calls us to seek first His kingdom and His righteousness. He knows what you need to live day by day and He is able to provide.
It is also understandable to want to bargain with God and say take anything from me if He will only let your loved one live. God does not want a bargain, He wants trust and surrender. To strive with God and insist on our own outcome, even from love, comes from our limited understanding. We do not know what is truly best for a life, but He does. He knows the future and what is good for each person. The better path is to commit yourself and the one you love into His hands, asking Him to work out His loving purpose, seeking to know His will rather than fighting against it. That surrender opens the door to real fellowship with Him, a communion that was the reason we were created, to bring Him pleasure and to walk with Him. Bitterness grows when we fight Him, peace grows when we yield our lives to Him as instruments of righteousness for His glory.
So I will pray for you both as individuals before God. I will ask the Lord to show mercy, for we come not claiming justice but needing mercy. I will ask Him to touch the body of the one who is ill according to His sovereign will, to give wisdom to those caring for him, to provide for your daily needs as you wait for treatment, and to guard your hearts from fear and guilt. And I will pray above all that each of you would put your trust fully in Jesus Christ alone for salvation, and that you would seek to walk with Him in the way He designed life to be lived. In Scripture, marriage is shown as a lifelong covenant of one man and one woman, and living together and sexual intimacy belong within that covenant. God calls us not to simply make a place for Him among our other relationships, but to give Him the whole of our lives, living a Spirit governed life in purity and holiness in fellowship with Him. That total surrender is where lasting joy and clarity are found.
If you have a faithful, Bible believing church near you, please invite its elders to pray for you both personally. Continue to bring your requests to God directly through Jesus, trusting His love, His mercy, and His perfect wisdom to do what is best. May He give you understanding of how deeply He loves you, strengthen you to live for Christ, and keep you in His peace as you trust Him day by day.