Other options to get rid of heartburn

I need other ways to get rid of heartburn. I'm 25 weeks pregnant and Milk doesn't work, my two prescriptions only make it worse, tums makes me sick, baking soda and water doesn't work. No matter what I drink or eat or do nothing is helping I have a constant fire in my chest and I can't sleep anymore because of it. I'm at a loss here. What other things can I do to help relieve it so I can sleep?