Cleaning helps undeniably force you to acknowledge that you asserted control over your situation and did something good with it. Keep finding moments to overcome the negativity inherent in depressive thoughts and it will have nothing on you any more. Depression's remedy is usually to take better care of yourself and it makes you not want to, this is why it's so horrible to overcome, but it can be done with consistent benefits of the doubt to yourself and improving your surroundings one day at a time.

Or did the depression let up enough to clean your room?

Revel in it. There are moments in life where you feel like you can do anything, and some where you feel like you can do nothing. Just store it in your heart and mind that both exist.

I need to do this. I have ADHD and it seems like such an overwhelming task.

Nothing like feeling that upswing hit

I will say that cleaning does seem to make me feel upbeat afterwards too. I should probably do it more...

Now wait until you have a big problem that isn't in your power to fix and tell me that depression isn't real

Fuck yeah! Go OP!

A big part of that attitude is simply that you're more likely to take care of those big tasks you've been putting off when you're on the upswing away from depression. So it feels good unto itself, but you're probably also in a mood that's more conducive to feeling rewarded than a deep depression.

TL;DR: Cause and effect feeding off of each other.

It feels like less than 2.

That's awesome, good job

I wouldn’t know