Defending myself verbally after a meltdown in class?

I have Borderline Personality Disorder, and my emotions unfortunately get the best of me sometimes.

I was speaking to my professor after class about a grade I got and while trying to explain something, I must have come across as lashing out. I really didn’t mean to. I had really bad anxiety at the time.

Anyway, I ended up having a breakdown after realising that I’d made her feel like I was angry at her or accusing her of something. A fellow classmate witnessed the event. My professor and I worked things out and there are no ill feelings between us. However, I am very nervous about my classmate and what she thinks.

I think I made my classmate miss her bus (she was waiting to speak the the professor as well, and then I had the breakdown). On my way out, she was on the phone with someone and she was obviously annoyed. I said “have a good night”, and she said, “you too”, but she was obviously not happy with me.

I’m wanting to know if anyone has suggestions as to what I can say to her if she mentions any of this to our other classmates or if she holds an attitude with me.

This was an extremely embarrassing and difficult event for me, and I’m sure I inconvenienced her. However, if she gossips or holds an obvious grudge, I will say something. I don’t want to come off as angry if I have to say something. I don’t want to have another breakdown, and I don’t want to be rude. So, having ideas of what to say that is both assertive and self-respecting would be great.

Thank you in advance.