How can you increase your ability to trust in such a difficult time? First, ask God for the grace to grow in your faith and ability to trust in Him. He will give you what you need. Second, proceed in your life as if He has already taken care of the things you need.
Jesus told us, “Have faith in God. In truth I tell you, if anyone says to this mountain, ‘Be pulled up and thrown into the sea,’ with no doubt in his heart, but believing that what he says will happen, it will be done for him. I tell you, therefore, everything you ask and pray for, believe that you have it already, and it will be yours. And when you stand in prayer, forgive whatever you have against anybody, so that your Father in heaven may forgive your failings, too.”
God can heal you. God can make your life happier than you can ever imagine. Believe in his love for you and trust that He will take care of you.