Yeah, it's likely what you think it was.
Congratulations on making a good choice that was within your plan while eating out. Now don't you feel silly that you thought that was all there was to it?
Stress, anxiety, and lively conversation make any meal a mine field for me. If I don't pay very close attention to what I am doing (instead of talking/listening) I will pay.
Early on I had a couple such episodes when eating out. The early bad experiences eating out made me anxious about eating out. Because of this I basically stressed myself into more episodes to the extent that for many, many months I just didn't eat out.
Eventually, I was able to successfully eat while dining out. I am still anxious about it, particularly when I expect conversation, so I am extremely careful about the mechanics and not coming anywhere close to eating too much. I still won't eat out in stress situations, like work. I could do it, I just don't want to worry about it. It's a great excuse to miss business meals, which are dreadful at best.
So kids, be careful when you eat out. Remember your manners, no throwing up AT the table. And, if you're like me, only converse when you're not eating and only eat when you're not conversing. No toys at the table.
Good luck,
Tek