Can masturbation or even sexual arousal cause a feeling of being dizzy, lightheaded, or out of balance?

Dizzy over love. I'd hope so... Life would be sad indeed if there weren't people who'd excite us enough to make our heads spin. Embrace & cherish this complex experience. Now, if you actually feel like you're truly going to faint, and other things trigger it also, you might be getting vagal and a talk with your physician about a possible cardiac rhythm problem (anything happen to your pulse?) might be in order.