I have anxiety attacks and I was told I quit breathing for a few minutes during my last attack. What causes this? Is this normal?

Very commoe. In panic attacks people normally have changes in their breathing patterns. You should see about starting yoga, meditation or taking a medication as this can all help and be life changing. .
You actually do not. stop breathing for several minutes usually 30 seconds or less The panic just makes you feel like you cannot breath.
Breath holding. is common with acute anxiety and panic and is not dangerous. Treatment of the anxiety resolves this issue.