Terrible heartburn

An

I'm currently 27w 5d and every single night like clock work I am woken up at 3:30 with terrible heartburn. I've been taking tums but it's a very short temporary fix to what feels like a huge problem to me. I see my doctor in 4 days so I was just going to wait it out til I saw her but does anyone have suggestions in the meantime? This is awful!!!! 😴😳