Is it normal that i lose half my vision and get dizzy after stretching

why not get some exersice and i dont mean yoga or competitive eating

Its orthostatic hypotension, its some kind of disorder or disease, though its not dangerous unless you do pass out. I have passed out before, because of this. Its wierd, if you do you need to see a docter. Let me explain how this kinda works

When you strech, you strain yourself, causing blood to pool at your legs and lower body, causing no oxygen for the brain which in result, causes light headed, blurry vision, weakness, confusion, and sometimes fainting. Hope this helped. Although i dont know how to avoid it except, stop stretching.. At least xont stretch for a long time like 5 seconds.

Here is some info: http://www.mayoclinic.org/diseases-conditions/orthostatic-hypotension/home/ovc-20324946

https://en.wikipedia.org/wiki/Orthostatic_hypotension

I have that as well, it is called postural hypotension.

Not necessarily normal, but common yeah ..
Pretty complicated but simply put it's because when you strain your heart slows which allows blood to pool in the lower part of your body ..
This causes a slight (temporary) lack of oxygen to your brain and low blood pressure ..