I have been diagnosed with orthostatic hypotension, however there is what I think is a side problem to this that I am being referred to a neurologist for and it is taking way too long.
Very often when I stand up after sitting down for a while, start walking after standing still for a while, start running after walking for a while my face will spasm, I will lose the ability to control my arms and often my legs (my right arm has a tendency to stick out behind me). It will be difficult to stand without standing in a contorted position and often I will want to stand on the sides of my feet. I won't go into the details of what happens to my face but basically the corners of my lip will droop down, forcibly. While I am seated, I also experience distinct weakness in my legs and an almost nauseous feeling.
This doesn't appear to be a full-blown seizure, I retain consciousness and it has none of the very fast, jerky motions that a typical seizure has. I retain consciousness and my movements are often large. I almost never fall down, but I will stumble and not be able to run for several seconds.
I'm 16 years old, I've had this condition since I was around 12 or 13 and it has escalated constantly since then. Immediately after intense exercise, I'm completely cured of this it seems for around an hour.
I should also note that there's an odd, sort of a tingly but uncomfortable feeling in what feels like under my skin and behind my eyes.