I see it's your first post - just wanted to say hi and welcome.

I can relate to what you're saying, my depression is like that too. I don't think it's uncommon for people with depression to go through stages of stability and then swing back into depression again. And chemical depression (sorry I have no idea of the correct terminology) sometimes doesn't need a trigger, per say. Seemingly trivial things can all become overwhelming and send us into a downward spiral.