I have a sick line for depression and need to inform my university(UK)?

whats causing your depression? is it because you don't have any friends or you aren't inspired by the course or do you think everything should be fine so it must be a physical reason? try to identify the cause and if you can fix it. Maybe you are missing home. Can I also recommend evening primrose oil capsules they are perfectly safe and are really good for you, I recommend you give them a try