Depersonalization

Hi. I am 17years old. healthy.
2months ago I started to have hard time breathing out of nowhere so I thought it was a temporary thing.. it wasn't.. it went on for awhile until one day I started to have this weird sensation that got to the point i couldn't stand up.. I kept on having difficulty breathing that my neighbor had to call 911.. They said everything was normal..i was just diagnosed with hyperventilation..(I don't think so..i still have breathing problems,it's not better I'm just used to it..) And that was a month ago.. And around that time.. I felt unreal.. like everything felt like a dream and like I thought there was something wrong with my eyes because i don't really have a good eyesight.. so went to the eye doctor he said nothing was wrong.. then i started to assume i had brain tumor for some crazy reason.. so i googled up my symptoms.. the closest i can get to was dp/dr.. I feel so numb and i'd constantly be dazing.. i forget things constantly.. i don't know what this thing is.. i'm not even panicking.. i'm just annoyed and worried.. :(