Could painful thoughts briefly mimic Major Depression?

So I wanted to ask something here.

I don't have MDD but I do have Dysthymia (and AvPD), which will play some part in this, but this problem I have is more than that -- I'm tortured with these persistent painful thoughts on a regular basis. I'll be feeling my regular anhedonic self, then out of nowhere I'll remember all those awful, cringeworthy, memories from the past year or so. They play in my head like a tape, they are as, if not more painful than when they first happened. And then I feel myself becoming numb, and soon enough I'm too weighed down to move, and even speaking takes the most effort, I feel in so much pain over these memories I feel suicidal every single second when I think them. Those aren't dysthymic symptoms, they're MDD symptoms, but of course they're reactive to these thoughts and I don't always feel like that, so it isn't true MDD.

I remember how much I hate myself...

As soon as I distract myself and they have left my mind, I feel somewhat better, but sure enough they'll be back again, and again, and again, they will never actually leave my mind.

Does anyone have experience with this thing specifically and is feeling this bad over them a common sort of thing?

I've had a similar experience in smaller scale. I'd be walking through town, reading a book, doing groceries and suddenly a memory like that would pop into my head, and a second later terrible embarrassment (about something that happened 15 years ago) and a suicidal impulse.

What helped in my case was going through those memories with my NA sponsor. I realised some of them weren't actually real memories, even though they seemed crystal clear, because they just didn't make sense. Some of them were most probably dreams. And the rest isn't as shameful as I kept on feeling. In your case it's different because you get focused on memories from the last year. My suggestion would be to discuss them with a therapist. The shameful and cringeworthy moments tend to be much less shameful when we get them out and our brains can no longer fiddle with them, amplify contrast and do similar things.

Hope this was a bit helpful. Big hugs.

Absolutely I've been dealing with the same thing but it's mostly over the course of events that happened one day a few months ago. The thoughts are very persistent and I feel like it gets more painful as time passes.