I'm writing for my sister who she thinks she may have a problem with this.
She's 30, and split up with her long term partner saying that roughly, he couldn't live with her mood swings. We had a tough time as our Dad died three years ago, but she's spoken to me that she has bitten herself on multiple occasions and can be quite up and down.
I'm no fan of internet diagnosis, but I wondered if anyone had any experience of this, and any advice.