Blackouts

Hi, im a new member. Im 19 years old and have been having this problem that no doctor seems to understand. It started when I was about 13, its hard to explain so bare with me...Well I guess what happens first is that my eye sight will go black, I can still see some things but its all blurry and dark. (if you take your index finger and press on the side of your eye an wait your sight will do the same thing) then I have this massive head rush, almost like im being choked, sometimes it feels like im drowning,i get a taste like I swallowed a bunch of water an got it up my nose an everything will feel foggy and dream like. After the 5-10 second head rush with my heart pounding my eyes go back to normal but I can see my pulse beating through my eyes and I can hear it in my ears too. Then my face actually goes numb. And all that is then accompanied with fatigue after. Sometimes when there really bad I actually lose conscienes and collapse, after I lose my memory for like 10 seconds to, I wont remembered how I fell.
This has been happening to me everyday about 5-15 times a day for the last 7 years...I just need some advice about what you may think it is cause honestly I dont know. After this started I noticed my short term memory got worse, im constantly tired even if I sleep for 10 hours an lay in bed for the rest of the day I will still be fatigued, the heat makes me black out more, im sensitive to cold, I have a lot of pain in my lower legs, like an uncomfortable pain, my muscles randomly twitch alot in my back and legs some in my face, I get headaches alot that are sensitive to light umm...I noticed that my heart beats really weird like one beat will feel much stronger but slower. These things are what I experience everyday. I have gone to doctors, my e.K.G was fine, my e.E.G was fine, so was my 24 hour e.E.G, iv been tested for many things like thyroid, diabetes, and anemia but it was all negative, my c.A.T scans where fine to. Any advice would help my search. Thank you.
Red dog