Worried about my appointment

I have an appointment coming up to help potentially set me up with work. I've been struggling to find a job for a while now so I really need to be perfect for this. But recently I had this mental breakdown that resulted in me making a very hurtful comment on a local community page. I just have this thought in the back of my mind that I've ruined my chances of finding work where I live just because I felt the need to lash out. I had a really eye opening conversation with my sister recently about my behavior and I just want to do better as a person now because of it. I just have this anxiety that I've already messed it all up.