I... Need extra money so I'm covering a colleague tomorrow at work but.... My stupid borderline makes it so hard for me

There's gonna be so many people I don't like around me.... Last week this happened when my best friend was spending time with his other friends (that I don't get along with) and I went into a panic attack so I quickly took a higher dose of my beta blockers and locked myself in the changing room to hyperventilate in peace and I hugged myself tight and rubbed my arms to tell my brain that it's gonna be okay.....
In a way I'm so thankful for my own work timings because I don't get to see the people I don't like because they have different working hours but boy oh boy when I have to cover other people....