Some of the signs of depression for me are

• You don't notice the beauty in the world. The colours seem drab and uninteresting.

• In more severe depression you will be shocked by loud noises .

• Your perception of the mood of the people around you will change. People can seem as if they are suddenly not able to be trusted and are out to do you harm. It is the hardest thing to ignore this feeling.

• Every ache and pain in your body becomes more and even your bed seems uncomfortable.

• one of the worst ones is you can all of a sudden feel extremely happy but that's just your body running empty of serotonin , straight after this happiness follows extreme sadness and a need to get away from people because the world for you has turned into a type of hell.

• Muscles feel weak as if you have not had proper rest.

• You never sleep deeply

There are plenty more things that happen. Here is little test you can do. Walk past a house that has loud dogs. In severe depression the barking of the dogs feels like it is almost hurting you. each bark is a shock even though you know it will happen. But without depression you hear the bark and your brain reduces the shock before you are able to feel it.

It is the reduction of shock or extra processing that I don't have in severe depression. I assume this is to make my mind work faster so that if there was a threat you would be able to react fast enough. But its no good to be on permanent alert.