1. Pray. What can this do? Many, many, many wonders. Whatever you ask in Jesus' name that he will do. If you have faith and just believe, God can turn the impossible to possibility.
2. Fast. There are many different ways of fasting. Some people may not eat until a certain time. (For example 6am-6pm). Some may drink water but not eat. But you just pray the whole day and have full concentration and conversation. Just you and the Lord.
3. Read the Bible. The bible has many stories, tests, and tribulations that might be similar to what you are going through. No matter what you read, it's all there to encourage you and keep you strong in the Lord.