I have tried to stop my pills tonight the depression comes back. It's because some types of depression are caused as some of the happiness chemicals healthy people produce get mopped up too quickly by the body. This means I will always need them. It's like a diabetic needs insulin. Are you sure you are not confusing tiredness with normal calmness when you take them. I feel full of energy when I stop then I crash really low. It might mean you need a different type it can take a while til you find one that works. The tiredness also gets better with exercise especially combined with music.
Don't do anything silly, tell your gp the truth and take any help you are offered.
Listen to your body too, and maybe don't expect too much too soon it has taken a lot of different meds, a lot of therapy and a gym membership to get me to where I smile more than I feel sad, and can feel I am worth loving and respecting. You can get there but it takes effort. It's worth it and so are you.