I am glad I asked as a head rush for me is when I get the chills that climb up and over my head.....
What u r describing is more of a head pressure and that can be due to a CSF obstruction or high CSF ...and that can be from over producing it, ur body is unable to absorb it....this is ICP or intra cranial hypertension.
POTS is Postural Orthostatic Tachycardia Syndrome is a condition of dysautonomia. to be more specific orthostatic intolerance, in which a change from the supine position to an upright position causes an abnormally large increase in heart rate, called tachycardia. Several studies show a decrease in cerebral blood flow with systolic and diastolic cerebral blood flow (CBF) velocity decreased 44% and 60%, respectively. People with POTS have problems maintaining homeostasis when changing position, i.e. moving from one chair to another or reaching above their heads. Many also experience symptoms when stationary or even while lying down.
SO take note if u get the head rush when u change positions...not just bending over as I had that too, but I was not DX'd with POTS....with POTS ur blood can also pool in the lower extremities so u feet may look red.....and keep track of ur BP.
source - http://en.wikipedia.org/wiki/Postural_orthostatic_tachycardia_syndrome
EDS= Ehlers-Danlos Syndrome- this is a connective tissue disorder that affects the collagen that hold us together...many with this are also hypermobile or double jointed....there are many issues with EDS as easy to bruise, slow to heal, sensitivities to foods, meds and other things like latex used on band aids and surgical gloves....we do have a EDS group with links to videos with more info-
http://www.medhelp.org/forums/show/417?camp=msc