I seriously need advice and help! 

I’m (planning on) going to see and surprise the guy I’m dating in a few weeks for the first time ever. It’s about a half an hour flight (I’ve never been on a plane before) and I’ll be staying with him and his family for 2 and a half weeks. He’s also just moved in with them a week ago! 
Only problem is, I have extreme high functioning anxiety and I’m so scared that it’s going to kick in whilst I’m there. 
It causes sickness, dizziness, numbness and so much more and what if I’m abroad and can’t do anything about it. 
I came home from uni 2 months ago because I couldn’t leave the house anymore. 
I have to go and see him, for personal reasons he can’t come to me so I have to take the first step but I’m terrified. 
Nothing is official yet, I’ve briefly spoken to his da but I spent all today and yesterday feeling like I was going to throw up and not being able to eat. 
Someone please help, I’m happy to answer questions, sorry if this is confusing. 

TDLR ; plane for the first time to see long distance bf for the first time with life altering anxiety. please help.