aw, I'm so sorry that you are feeling this way. I think we all feel that way sometimes.

Feelings are one of those things that can hurt so intensely that we don't even know what to do with those feelings. It seems like that might be happening here maybe? It's almost like you can't even stand it anymore - I usually just want to hit myself in the head and say snap out of it, but that's easier said than done

I'm right there with you.

Although it sounds like you didn't do anything wrong with accidentally interrupting your supervisor. It seems like you were being very considerate asking how much time you had. And maybe the reaction of your coworker laughing was his/her way of brushing of the situation. People handle things differently. I find some people who can laugh things off - god bless them! Maybe s/he was trying to lighten up the mood?

hang in there hun. You ok??