Head rush, dizziness, black spots, head pain?

Hello,
I've been experiencing these head rushes for quite a while, now. I believe that they seem more severe than the usual, and even though I have been investigating them, no one seems to have quite the same ones as me, being that I have an extra symptom.

Usually, it happens when I am sitting, then stand. I stand up and instantly become dizzy, feel very faint and become off balanced. I normally fall down, unless I hold onto something. My vision goes black, and I feel my heart rate pick up. I feel semiconscious, like I've fainted but haven't at the same time. Then, unique to my case, right between my eyes hurts -like a brain freeze, or a severe headache- for a while. These "head rushes" mostly last for 1-2 minutes, rarely more. I eat and drink well, and consider myself healthy. I do suffer from anxiety, but I don't believe that is the cause. Anyone?

Thank you! I've been researching on this, and this explains things so well. I'll have to talk to my doctor about this. Again, thanks!

Did you get dx'd and treated?