First of all i'm sorry for your depression and wish you all the best on overcoming it. As many will tell you, you're are not alone in that boat and there IS a way out.
But i think advice like this is almost as useful as "Just be happy, the world has so much to offer!" to a depressed person.
This cycle you described is something almost every human being on earth goes through, day to day. For some the down-phase is way stronger, crushing and exhausting, to an extent unimaginable for the rest. But still, everyone has it.
You made a good start by reflecting on the change-cycle of your feelings. Key is now to find a way to make best use of that knowledge in order to weaken the depression.
There are many different teachings that will help you find that wisdom.
Meditation (for example) can help you weaken that clinging for and aversion to 'good times' and 'bad times', resp. Clinging/Aversion itself is a very subtle process, which we usually don't notice consciously, but adds a lot to how our feelings turn out.
Trying to be aware of it, gives you a whole new viewpoint of the status quo.
This cycle you described is something almost every human being on earth goes through, day to day. For some the down-phase is way stronger, crushing and exhausting, to an extent unimaginable for the rest. But still, everyone has it.
You made a good start by reflecting on the change-cycle of your feelings. Key is now to find a way to make best use of that knowledge in order to weaken the depression.
There are many different teachings that will help you find that wisdom.
Meditation (for example) can help you weaken that clinging for and aversion to 'good times' and 'bad times', resp. Clinging/Aversion itself is a very subtle process, which we usually don't notice consciously, but adds a lot to how our feelings turn out. Trying to be aware of it, gives you a whole new viewpoint of the status quo.