Unbearable Acidity Pain. Something else?

I am currently 30 weeks pregnant and I have a low risk pregnancy. I have not faced any issues till now the only problem that I am facing from last month is gas attacks. It happens all of a sudden and middle of the chest between the ribs. It's so extreme that I feel like I will pass out due to that pain. My BP also drops. This happens in every 10-15 days. I am very scared. My doctor thinks it's gastric but could it be something else? Last time it happened I was unable to move for about an hour and then my husband took me to the hospital where the doctor gave me some pain and gas IV. My BP also dropped to 90. The moment pain was gone my BP also went back to normal range. And I don't have any BP problem Nd I also have high pain tolerance however this pain is really really bad. Kindly suggest some SOS pain tablet and also let me know what you think is the problem.