Upsetting conversation with a co worker

Beatrice

I suffer from depression but I was doing better lately, until 2 days ago when I had a conversation with a co worker that made me feel so bad it triggered another depressive episode - and now I feel really shit.

I’ve always tried to be friendly with this person but she’s never really reciprocated, always talked to other people and not me when we were all in the same room. And this time she said something about me that made me feel really insecure about my work and my skills (I am working towards a small promotion and she basically hinted that she doesn’t think I should get it, even though my boss is really supporting me.)

I cried that night and have been feeling really shit since. What can I do? How do I stop thinking about this and giving her all this power?