Do you experience daily mood swings?

I have both adhd and depression and am struggling to identify if this is more my depression or adhd. Everyday I'll get a couple hours of just a super low, depressed, apathetic, anhedonic, hopeless mood with avolition and despair. Thoughts are completely negative and hopeless and cognitive distortions run rampant. There's not really any event or situation that triggers this as it usually just pops up out of nowhere. I could be reading a fantasy book and 30 minutes later just feel absolutely atrocious and so depressed even though all I did was read. So is this an adhd thing or something else?