Why when i have a panic attack my vision is disoriented and i get flashing zig zags in my vision?

Hyperventilation: Can cause visual changes. Blurred vision & tunnel vision are not uncommon.

Ocular migraines!: Ocular migraines are a form of migraines that take place in the occipital cortex (part of the brain that interprets/controls vision). They lack the severe headache as common migraines. The symptoms are usually all or mostly visual and are typically described as flashing of light or ziz-zag lights in the vision. They usually last less than 30 minutes and affect the vision out of both eyes.