I never knew what was happening till recently. When people talk about seeing stars, I thought it was in the cartoons.

It seems to be hooked to strain on the body. Like..during BP, when the lower regions go into the "push" phase, I feel like I am going to faint and there are moving spots in my vision.

It is much worse since things have been changed to the morning. At night it did not have this effect.
Any idea why this would happen?