Lethargy and/or depression

[Functionalfool]

I was diagnosed with Ps 2 years ago but I've had PsA for a decade. I have had sporadic issues with depression long before I had this disease so I can't blame everything on Ps! I know what standard depression feels like and this feels different. It hits me like a ton of bricks then it goes away after 10 days or 2 weeks. That isn't, in my experience, how depression works. If I get on antidepressants, by the time they kick in, I feel better. I don't think I have what most shrinks wound consider your run off the mill depression. Has anyone experienced anything like this or is it unique to me? I started a journal to try and pinpoint how and why, but it will likely take a while for me to see a pattern.

I just want some advice from someone who knows what I'm going through. I don't want to divulge much more info on here than I already have so a pm would be better.