OK, Maggy-- I took a chance on you.
There isn't just one astrological signature for depression, but you've got one of them, Saturn conjunct Mercury. Mercury is your thinking function. Saturn can show where and how we feel inadequate and not good-enough.
I don't think your moon-Neptune square helps. This can make you extremely idealistic at times, only to have your dreams dashed, so that bitter disillusionment sets in. With this aspect, you can sort of miss the grounded reality in between.
Then your sun-Pluto.... you need a lot of intensity in your life. Pluto was the Roman god of the underworld, and at times he makes people feel stuck in that place. But Pluto's time is always cyclical. You've got the energy of the phoenix. Life might seem in the ashes now, but the golden magical bird will emerge in time.
Have you been diagnosed with depression? If so, how is it being treated? NOMB, but some people with depression find yoga or meditation helpful. With your Mercury-Saturn in the 12th house of seclusion, you would seem like a natural for it.