Insane Panic Attacks - Possible OCD(?)
So here goes: I am 20 and I have been doing my bachelors in Amsterdam the past three years. The past September I got like insanely physically and mentally ill, I experienced psychosis and I was really paranoid, so my family told me to pack up and go home, and thankfully my uni let me finish my semester remotely. This February I went back thinking all was well but long story short I lived through unimaginable agony and when I came back home to visit in March I said enough is enough, and I got to finish the rest of my classes online again. The only requirement is that I have to do a presentation course (it's literally only one fifteen minute presentation that cannot be done remotely) next week. I booked the flights, booked a hotel, begged my brother to come with me because the thought of doing it alone made me want to genuinely vomit, and I'll only be there for three days. And then I can graduate in June. And despite all that, I STILL WANT TO RIP MY HAIR OUT. We are now a week away, and I wake up sick to my stomach every morning, I have panic attacks, I have nightmares, I hyperventilate, and I have this really weird thing where my body feels super light but my head feels heavy, and when I move my eyes I get dizzy and I am super sleepy even though I slept a full eight hours. My brother is trying to reassure me that he'll be with me, that it's not that long of a trip, that he'll try to distract me, but my brain is not listening. I am feeling fear and panic like never before; my paranoia is back and I am calculating all possible scenarios. I feel actually insane, like I am so far past the edge I need to be put in an institution or something, because even waiting until the trip makes me want to get on all fours and scream.
Please, please, PLEASE, if you have ANY advice on how to tell my brain to shut the hell up so I'm not getting sick all the time and I can be at least functioning enough to travel so I can get this degree already, PLEASE help.