anxiety, low blood sugar? low blood pressure? dehydration?

So I generally have a hig stress level. Just yesterday I cam home and couldnt see anything. Like my vision was like an optical illusion there was a big bubble at one point floating. my vision was like that picture effect to make it seem like water. my hands and feet are always freezing. i'm very pale with dark circles under my eyes and my energy level flucuates greatly. any ideas of causes? Low blood sugar? low blood pressure? dehydration? Oh and my arms and legs tend to haev muscle spasms or my arm shakes alot- especially when i am nervous or something.