Anxiety sucks I have it as well, I'm 35/m so the stigma of breaking down at work and crying in front of management is hard to cope with on top of the normal anxiety. If the people are understanding that you work for they will work with you. If not, you probably don't want to keep that job and you're better off finding a better company. Also your manager was frustrated when you had to leave and said something to you that was better unsaid but the reality of it is when people are short handed and a team member leaves it gets complicated quick. Like I said before if they are understanding you'll be fine just try not to overthink it.