Kajero,

By definition, if cycling made you feel better, than you wouldn't be depressed. Just try to remember that there is no reason for you not to enjoy cycling again, once your depression remits. Now if you had the flu, or a broken leg, you would not be surprised that you are unable to cycle, let alone enjoy it. But depression can often rob one of even remembering a time when there was anything else, other than the depression.

By all means, continue to pursue the activities that gave you joy, and continue whatever routines you can to keep your life going in the meantime, to whatever extant you are able. But when the depression robs you of joy in the present, remember that your belief in a joyless future is also a symptom of the depression.

Please, get whatever help you can to overcome this depression. Just the fact that you have posted this thread shows that you are still able to muster efforts to control this beast.