At 45, there is a good chance you already have hav1 and don’t know it. 90% of those with it never get a cold sore. If you already have it, you can’t get it again..
I don’t know why your lip burned, but you wouldn’t have symptoms nearly that fast from any infection. The soonest you’d have symptoms from herpes is 2 days. Maybe it burned because you had a lit joint on your lip? I don’t mean to sound mean. I’ve smoked in the past, and remember that sensation.
You can test to determine if you already have hav1, but really, if you do, what is going to change in your life? Don’t kiss your kids on their mouths if you have symptoms of anything (always a good rule), and same goes for your wife. If you have symptoms of anything, don’t give her oral sex.
Also, it’s cold and flu season. Don’t share joints, utensils, drinks, etc.
Dr. Handsfid is no longer answering questions on the site.
Just don’t panic. There’s no need to. Over half of the world lives normal lives with hsv1. If you have it, you can too.