[new At This] Not Sure If This Is Anxiety Based*please Read*

Okay so heres my story. If you have any information that might help me or re-assuring words id be very greatful (im quite desperate!!!!) please! I feel very sad/scared/confused about everything. It started about 5 years ago. I was in grade 5 at this time. One day I was suppost to be going sailing and all of a suddon I felt very nautious, dizzy, overwhealmed and I was very scared (but I didnt ever have motion sickness before). Then it lasted almost all night. I thought that was the end of it but it kept re-accuring that whole year. I feel that fear played a big role in it. It eased off for the next three years but still came on very irregularly. Whenever this would happen I would be incredably scared of dieing and such. So I had many test done and they all came back normal. Then one day almost 2 years ago my appendix burst. I was in the hospital for a week then came home and things turned around for me. I convinced myself that that is why I had the nausia, dizzyness and everything (because of my infected appendix) and for a year it was great! Whenever I felt the slightest bit sick I convinced myself that it was impossible. And I felt well mostly all of the time. Until this winter and I kept getting re-accuring tonsilitus and had been seen by an e.N.T. Specialist. So I was booked to get them removed for about a week ago. But 28 days ago I was walking down a highway back from vollenteering at an animal shelter when I thougth to myself "wow I feel like im not really here, like this isnt reality" and it felt like I zoomed forward some how and it hit me like a wall of dizzyness, fear, unstableness, and numbness. I ran to the nearest store and got picked up and went home and slept for the rest of the day. The next day I felt very "out of it" and kind of dizzy and somewhat disoriented feeling. Then 2 days later I was still feelign a bit off but I had figured I just was getting over some weird bug. So I was watching a scary movie with my best friend (normally scary movies dont phase me) but this time was weird and different. My feet and hands went very sweaty and cold and so I turned off the movie and went downstairs to my mom and then it hit me again it felt as though my body wasnt my own kindof and felt like I "zoomed in" and felt very out of it and I panicked and my heart raced and everything I saw was like jumping back and fourth and I felt liek I was going to pass out/fall over and I was rambing to my mom so scared that I was dieing and felt like I coudlnt breathe so we rushed to the hospital and was in emerge for 5 or 6 hours and had e.K.G. And my heart rate was 110 over 80 when iwas in the acute attack and 64 over 30 when I fell asleep. So I had a 48 hour heart monitor the next day and it came back fine along with a 24 hour blood pressure monitor and mri and e.E.G. And e.K.G's and blood work. Everythings comming back normal. And im so scared. So about a week later I had an overwhealming attack of it again and went to the hospital in an ambulance. The fear I have is unbelieveable. So now I havent had another bad attack of it in abotu 2 weeks. But I can barley go outside and I cant see my friends and im so scared that im dieing. I feel very sad too. I feel liek im never getting better and im only 15 please I need help with this. I feel so confused about everything. So I constantly feel quite "out of it" and liek im not really here. Im very scared of this and I need help for it. I dont know what this is. If is e.N.T related or physological but I need answers. Please. If you have anything please dont hesitate to email me.
Thanks for your time and please im very scared.