dizziness and more

Hi, I am a 20 year old male 75kg and 168-170cm .I have been having a problem for almost 7 years ,once a year or twice(it did not happen in 1 or 2 year of those 7) i keep getting dizzy to the point i cant stand up ,I don't feel any pain only a weird annoying sensation around the head but mostly above the eyes in the frontal portion of the head (it is like when u are sleeping/laying down and then u stand up and u have a weird sensation a pressure like sensation though here it is ten times worse ) and the dizziness comes with :- 

1-I cant see everything clearly it is like u are peeping through a tinny hole .

2-i keep sweating a lot when it happens . 

3-i cant stand up so i have to lay does on the ground for about 6-8 min until it completely goes away. 

4-i can breath but i feel like the air is not enough and i need more. 

5-sometimes i blackout for 4-5 sec and 1 time i slept . 

I only remember those 5 thing I don't know if there is anything else first time it happened i was at home and i went to the doctor and I did brain scans and everything but nothing found and it turns out i needed glasses and we though it is because of the glasses but after a year it happened again an so every year it happened 1 time with the most recent today before 2-3 hours it happened in different places ones in a class,home.supermarket,bathroom those what i can remember so pls if u know anything about it comment with your answers. thanks

Take yourself to A&E ASAP!!! 

Is it that serious? I am currently not in my country and i am going back to my country after a month or so.I forgot to say that this happened yesterday not 3 hours ago but i forgot to change the post(I posted this in yahoo but no one answered then i found this site)and I did Ct and brain scan 2 years ago and nothing was wrong and the doctor told me stress but yesterday i was not stressed that is why i asked this Qs on this site. Thanks

I'm with Travis ,go to Hospital ,if your blacking out ,that's a drop in blood pressure my guess ,but if it's a regular occurance you need it looked into ,are you on any meds that can do it to .Have you had any headaches ? Or injuries to head ? Pop to a hospital .get checked out .

i blacked out only once which was 2 years ago but that one was definitely the worse though no pain just annoying sensation the the stuff i said above and i am not taking any meds i was taking meds for nasal cavity inflammation but that was 2 years ago right after i had the dizziness and i am was taking B12 vitamins because it was low when i took blood test but i stopped and no headaches nor injuries to head only dizziness .