Hi, I'd like to help you with your question.
It sounds like your son may need more treatment besides medication. Is he willing to see a therapist? If so, ask your doctor for a referral and make an appointment.
Depression can cause a person to lose their motivation and desire to care for themselves. It does sound like your son is able to do some things, like attend church, which is a good sign. He is also making future plans, also very good. But his inability to work or continue his studies are both signs that he feels overwhelmed by his depression. People who are depressed feel hopeless, experience negative thoughts, sleep too little or too much and lose motivation. Appetite loss and apathy are also signs. Suicidal ideation and/or plans can also be a symptom. Since your son is making future plans, this is a good sign. However, he needs an evaluation and treatment to prevent his depression from getting worse.
If your son will not get help, you may want to consider taking him to your local Emergency Room. They can evaluate him and determine if he needs to stay inpatient for treatment. You can contact your local hospital for more details or speak with your son's doctor for information.
Also, learning more about depression and the signs to look for will help you and your family understand what to look for and how to help your son. Here are some resources to help you:
Finding support for you and your son's family is also important. Try www.nami.org for on line groups and assistance. Even if you are not located in the U.S. you can still utilize these services. Also, they may be able to guide you to services that are in your area/country.
I hope this has helped you,