Can a nervous breakdown happen over sudden identity confusion?

This introject took me over again because things were going really well in several parts of my life. It came to sabotage everything. It feels like it takes me over, like I am possessed by it and need an exorcisim to get rid of it. Im not religious but that's the only way I can explain how hit feels.

So it came to get me lastnight after work, and made me drink 6 beers. it happened suddenly on my way home from work-it just took me over and I felt really, relaly depressed . I don't even like to drink. It did some other things but I don't want to write all of the details here. This was after feeling really good for a few days, and thinking positive, and thinking about how my life is going well in several different ways. And after my last therapy session, my worrying & anxiety totally disappeared. It felt amazing. I wasn't hypomanic at all, just calm, content, and truly happy and optimistic for the first time in a long time. Then it snuck up on me and came to get me and was laughing at me. It wants me to die.

I usually hurt like it's stabbing me in the chest with a knife, but suddenly it felt like the pain was coming from within my chest this time. It hurt so bad, emotionally. I was crying so hard. I don't know what the pain meant. I am scared because I started to get confused about who I am. I started wondering if 'me' is the introject, and the other states of myself were the ones who took me over. The opposite of how it's seemed. Then I felt like I was going to go crazy, a little calmer now.

I've been crying so hard. I texted my therapist but he hasn't been able to get back to me yet. I just wondered if anyone knows if someone can have a complete breakdown because of these issues. People talk about DID all the time but I hardly ever hear the actual details. thanks

**Please don't tell me to go to a hospital that is really triggering to me thanks