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Autonomic changes that occur with change of posture can cause drop in blood pressure, dizziness
, black outs and fainting
. Though this can be normal sometimes, when recurrent it needs to be addressed. A simple blood pressure examination in lying down, sitting and standing posture will let you know if you have a significant postural drop. If the drop is significant it needs to be evaluated.
In addition, I also suggest you to get a basic cardiac evaluation done. Basic EKG with or without 2D echocardiogram
will complete the evaluation.
If blood pressure changes, EKG and echocardiogram are within normal limit, then you do not have any major problem to be worried off.
Hope this helps.