Sounds like orthostatic hypotension....a sudden drop in blood pressure when changing positions...espicially when going from laying down to standing up. Try getting up slower and see if it still happens. A tilt table test or hemodynamics test would be the way to go for a diagnosis.
Could also be from low blood pressure. Go to the doctor.
It could be anemia (low iron). But it could be many other things as well. You really should see a Dr.
Yes you should as soon as possible and mae sre it is nothing serious that needs to be addressed.