Score cancelled due to miscoduct

My GMAT score was canceled because I pulled out of a paper out of my bag during my break time.
It was my first time taking the GMAT (I know it is not a good excuse), but I didn't know that it is prohibited anytime during the test.
I was too focused on the exam itself and didn't pay attention to read the rules. It was my fault.

I read all the posts related to this, but seldom did they talk about the experience afterward.

I called the customer service, they said they are not sure what kind of notice the GMAC will send to the schools,
and are not sure whether the record will last for 5 years or longer since it depends on what kind of misconduct I've done.

I feel miserable now Full of regrets...

Not sure whether it is better to take GRE instead or just briefly explain it in my optional essay.
Can anyone share some experience? Thank you in advance