What happened: I work in a big company. I left my daily standup meeting and returned to my desk before the meeting ended, without no apparent reason and with all the people wondering why.

Why: I come from a period of very serious personal matters (losses and other stuff), so stress is up to the roof and I'm very tired. I was almost dissociated and thought the meeting ended.

I've chosen to notify my team leader saying I'm having a terrible time personally and that I apologize and am embarassed about what happened. Do you think it's a correct reaction, also in terms of what I discolsed, or should I share the reasons why?

Edit: I also think that self-monitoring my state and my ability to work should be a viable solution, to avoid repeating this.

Update: I decided to go like described above, with just minimal disclosure and no detail. The TL brushed it off with a laugh saying "don't mind"; I'm obviously working, nonetheless, to get out of this situation, took also some days off.