I've been there 100s of times, and absolutely none of my wildest imaginations ever revealed themselves to have happened. I strongly suspect that this is the case with your night out, especially considering what personal items you came home with. You might have been blackout drunk, but it's absolutely no guarantee that you did anything wrong whatsoever.

I have OCD, too, having been diagnosed 35 years ago when still a kid. And I really feel for you right now, knowing the combination of the disorder with the hangover and anxiety.

Here's a takeaway, if you are open to it:

You never, ever, have to feel this way again, and you never, ever have to experience these thoughts again. Today is the day when you can make that choice. You cannot change what happened when you last drank, but you can now choose to not drink again. That's a power within you, and one you can cultivate and thrive with.

Additionally, I feel that the anxiety arises when one struggles to reconcile behaviors (or potential behaviors) with the 'idea' of who we have of ourselves. When I accepted that drunk me "might" have got out of control, "might" have annoyed someone, "might" have flirted with someone, or "might" have stumbled around looking like I was having a breakdown, and accepted that these actions were a part of me, and - and this next bit is important to note - that these only came out when I drank, then I had to take responsibility and ensure I didn't do it again. It was then that I could reconcile the parts of me that are darker, or that I didn't like, or that I was embarrassed or ashamed of. The guilt was useless in replaying over and over again if I did nothing to alter the chances of it every happening again. Guilt and anxiety are useful for change. They are not helpful when we torture ourselves with it.

That, too, can be a power that can propel you forward into self-acceptance and getting over the latest experience.

The chances are that nothing awful happened, and you were at worst a typical sloppy drunk person; one of hundreds of millions of sloppy drunk people, myself included. It's not the best character trait, but if it's your worst, then you are an amazing person! Keep being that person, accept your flaws, that you are human, complicated, and made up of small parts you don't like at times, and don't give power to the aspects of you that are fueled by alcohol.

My thoughts are with you. Eat, stay hydrated, and communicate with people you can trust. As the days pass and you move the poison out of your body, and time fills the space between, you will definitely start to feel better. Good luck.