Low blood pressure hypotension

Does anyone else suffer from this? When I relax and lay down ( which is often because im always fatigued)

My blood pressure drops really low, hence when I stand up I get really dizzy and get a head rush.

But once im up for abit and moving around my blood pressure comes back to normal.
Im getting fed up because I need to lay down as im always tired, but then when I get up I almost pass out.