The problem with drugs for things like depression is that they take a little while to work and often it takes a while to find the right ones for you and the right dose. So on that front I would tell your doctor you're overly happy at how they make you feel and ask if there is an alternative.
For yourself, you could also look at natural helpers. Exercise and getting out in the fresh air has been shown to help, also exercise is more likely to help you sleep (which also seems to be a problem). Obviously getting a good nights sleep is very important, so you could try relaxation techniques, bath before bed, lavender, actually going to sleep when you feel tired rather than waiting until your allotted bed time.
The remedies mentioned above may also help, but you need to discuss them with your doctor as just because they are natural does not mean they won't interfere with your other meds.
I'm sure you will find something that helps, just unfortunately it is not always the first thing you try. Keep persevering and don't be afraid to tell the doctor that what they have prescribed is not working (and why, the more info you give them, the more info they have to make an informed decision about your drugs) and you would like to try an alternative.
Good luck