Heartburn/GERD anyone??

Hello everyone! So every night I literally get pain under my breasts, it’s so bad that I literally cry. Few minutes later, I throw up. Pain goes away after I vomit not always. It’s worse at night. I can never sleep anymore & it sucks. It’s depressing. I have an almost 2 month old baby girl. I tried antacids and tums & nothing works. I changed my diet as well, nothing. I’m sick of living like this. I don’t know what to do anymore. Suggestions? Opinions? Advice? Please I’m desperate. Thank you.