I left the gas stove top burner on by accident for over 13 hours today, I found it a little bit ago when I went to get water. The burner was on low, with a small flame. Could I have carbon monoxide provisioning? I have all my windows opened for about 2 hours now. I can't believe I did that, now I'm panicking and having anxiety attacks worrying if have or will get poisoned. Ugh I cant believe I did that! 

If your not having any symptoms you probably dont have nothing. But if will make you feel better you might go to E.R and tell them what happened and let them know you just want to be checked out for it. 

if you had a flame you don't have to worry 

Cindyln is right. As long as a flame was going you will be fine. It's only when you leave the gas on with no flame that you could get sick. 

I left mine on one time all night but with no flame...I just made sure I didnt light anything with a flame in the house and opened all windows and went outside to town for a while because the smell was terrible. 

You can call the fire department and they will test your levels to make sure your home is safe. 

An open flame not burning anything will not hurt you. Think about the pilot light on things...