Hi @Ant7,
I can understand what happened to you, as it happened to me too. The average person just doesn't understand what a serious problem depression can be. I often think this is because a depressed person can look and act normal - we are not necessarily all sitting in a corner with tears running down our faces 24/7
(although some of us are.)
When I became depressed, I was still working full-time, still doing the housework and still socializing to some extent. I was able to smile and hold a normal conversation. However, I felt terrible and when I was alone I would descend into panic, feel terrified for no reason, sleep a lot, feel anxious and have racing, bizarre thoughts. Not pleasant at all!
Because my partner could not see inside my head, he thought that there was nothing wrong with me and that I was just trying to get his attention by saying I was unwell. He would discourage me from seeing the doctor and taking medication.
However, I knew I was unwell and I sought treatment. For most of my illness, I was actually too sick and exhausted to try and draw my partner closer and explain everything that was going on. Plus, I just gave up on him, anyway. Maybe I was secretly looking for a way out of a troubled, dysfunctional relationship?
@Ant7, it would be a good idea to take your wife along with you to a doctor's appointment so that she can see that the doctor takes your illness seriously and does not say things like "you are only a little blue." That way, your wife can ask questions, too.
You could also get some pamphlets about depression for her to read, or even borrow a few books on depression from the library for her to look through. Many libraries also have DVD's about mental illness that you could watch together.
If you go to a psychologist, you can ask the therapist if he/she can do a joint session with both you and your wife to assist you to communicate around this issue.
If she still does not want to acknowledge the problem, it may be her way of coping. Some people just shut down and can't accept challenges like this. Don't push her. Just continue on getting treatment and continue to do all the things your doctor advises.