I was hungover at work today.
Is that why you were so quiet at work today?
Yes, I was out partying last night and had too much to drink.
I know that you want to go out and drink with your friends, but it's irresponsible to get drunk when you have to go to work the next day. Try to drink in moderation on a work night. You can still enjoy yourself and have a great time.
It's not like I got totally wasted. I'm fine.
If you're hungover, your performance will suffer. It is not a good look that you are feeling so bad. The solution is simple: drink less next time so that this doesn't happen. If you can't control your drinking, it's time to seek help.