cjsg thank you for your advice helps a lot... Laura go to a Dr they can put a little thing on your finger and this will messure your Oxygen level in your blood. Anty time I go to Dr now they do that becheause I had myocarditis a heart condition in Jan. Thankfully I have no permanent damange to my heart but they still do this as precatuion. Mine is always between 98 and 100. When I had anxeity/panic attack a while back this is a VERY common symptom which has no real danger...its due to a slight change in blood vessels in your brain stil was scary but maybe get a quick check up to be sure best be safe... in the mean time try sitting up really slow to reduce how quick your blood pressure drops upon standing.