Serious heart burn

So I have never had heart burn, literally ever but these bast few days I have had it so bad to a point I feel like I can’t take full breaths, I haven’t changed any eating habits. One of my coworkers said same thing happened to her when she got pregnant with her twins. I am not (that I know of) pregnant but this is so bad. Any ideas or suggestions to help it or any ideas what could be causing it????