What can bring on sudden acid reflux in someone who's never had it before?

Yes I have reached out to my GI but it’s a long weekend. Hoping to hear some comforting words before Tuesday.

I am suddenly having daily acid reflux. It’s not horribly painful, but it’s there and it never goes away and I’m scared. I have never had upper GI problems of any kind before and I’m just afraid this is my Next New Health Adventure or something.

Is there anything relatively innocent that could have brought this on? I haven’t drastically altered my diet recently or anything.