Hello there!
It's sad to hear this, hmm I don't know if my words will assist you. However, I will go on to waste your time just like you did to mine (See what I did there?).
I do agree throwing up is nasty in all occasions, whether you were on the worlds biggest roller-coaster the one you longed to ride or whether it was in a funeral. It's the same ugly feeling.
Being a depressed ENTJ can be a reason, a logical explanation too, while an introvert can be an extrovert it can be exhausting and same goes the other way. Even when you can't see it, you could be a loving extrovert who is slowly drowning herself thinking she is an introvert. This causes depression, imagine if you were trying to be someone you can't be, it's just not right. Trust me, been there done that.
What I assume is that the reason you are in a dump is because you are truly a EXXX fooled through time and apparently vomit that you are IXXX. If you doubt that, then let me just say that vomit can trigger a need to be alone (what you think to be introversion) I can't imagine myself, even if I were an extrovert, happy and outside vomiting on every tweeting bird and person I see. It would be normal if you were to stay at home for a long time.
Another point I'd like to state is that you shouldn't think about it (slap me if you don't obsessively worry and think about it). Don't think about it and don't worry about it, the more you do, the more it will happen. Keep calm and know your limits. I have anxiety and it seems that the more I think about it the more I black out. I remember there was a time in my life where I would black out suddenly and I was like an insomniac I never slept from my annoying thoughts, this has to do with your fears being triggered by your subconscious. Don't think about it and don't worry.
Try to busy yourself whenever the thought comes to mind. You could also start again and try to find yourself if you aren't sure of who you really are. You could be shy but wanting the accompany of a lot of people, you might be deceiving yourself. I know I once did. Study yourself, and go easy on your thoughts.
The INTP point, I don't understand it. I'm a J and I don't make my bed, nonsense she needs more proof!
I really think there is a chance your an ENTJ since you seem really stable about your NTJ characteristics. However, I could be wrong.
I really hope my words were helpful.
If you need help, what could I be of your assistance?