However, now Kendall knows what she is struggling with, she has found new ways to cope with her anxieties and can calm herself down easier.
Speaking to Good Morning America about coping with her own anxiety, she added: "On the days that I don't really have as much going on I tend to get a bit anxious and to calm myself down I'll usually read a book or meditate."
Kendall previously opened up about her anxiety, admitting she is a "hypochondriac".
She said: "Since I was a kid, I've always been a hypochondriac. I've always been the worst hypochondriac. But now I have to try and be a big girl."
And Kendall is "still trying to cope" with her anxiety.
Speaking on the family's E! reality show a couple of years ago, she said: "I'm still trying to cope with my ongoing anxiety."
A counsellor added: "You need to have a better work/life balance."