If you don't want to read all the post, you can skip the "premise".

PREMISE: 
It's been a rough week, so, yesterday, I did go out with my best friend for a few drinks (maybe more than "a few"). I came home drunk and had a chat with my ex, but as the conversation kept going he told me things I didn't want to hear, so I decided to go to bed for my own good (I felt like I was about to cry). This morning I got up and I had to puke, but the thing is... I'm quite sure I vomited my antidepressant (efexor). 
-end of premise-

I got back to sleep, and woke up very depressed, thinking I wanted to die.. as I got out of bed, a few minutes later I noticed I was trembling, I was alarmed but not so surprised, since it's a few day's I'm having recurrent anxiety attacks again. Then it became way worse.. I felt an intense pain in my chest, like anguish. It was so unbeareable that I wanted to stab myself in the chest with a pair of scissors to make it go away. As I began shaking I had racing senseless thoughts running into my head, and that made me notice I was not lucid anymore. I don't know if I was just  light headed or dissociated, but it seemed like I was going crazy. I turned my pc on and began to talk to my ex about what was happening, but it was difficult for me to stay in one place and remain still, as I was feeling quite hyperactive from the panic and the nervousness I was experiencing. As I was chatting with him I suddently had the unexpected vision (maybe it was more like a flash) of him in his room, feeling stressed and annoyed because of me seeking his help, thinking I was a burden and that he didn't want to help me. After this strange flash passed an intense sense of guilt pervaded me, I felt disgusting, rejected, and a burden for him and everyone... so I kept writing him that I was sorry. This vision was so real and intense, in that brief moment I felt his emotions all in once, just like I was him, and the real me didn't exist (maybe I should say "the emotions that my brain attribuited to him in that moment" that didn't correspond with reality). One or two hours passed and I was still shaking and trying to fight this, because I was so scared of letting these feelings overpower me. I didn't want to have a full blown panic attack.

What did I experience? Is there a name for it or something that can help me explain it? I'm really confused, ad I already had horrible panic and anxiety attacks in the past, but none of them were like that... it was like a bunch of crazy feelings and symptoms all in once.

If I sounded repetitive and if I made some errors, it's because english isn't my first language.