Relief for GERD chest pain?

I’ve had random bouts of a crushing chest pain in the center of my chest for over 25 years. A few years back I thought it was gone so I went to sleep, and it woke me up in the night which hadn’t happened before so I went to the ER where they diagnosed me with GERD.

I’m struggling to find relief though. It doesn’t happen very often but when it does it lasts for hours (up to 2 days) and only intermittent relief is drinking water. Difficult to sleep as the second I lay in any kind of position the pain comes back. Last night for example, I was up until 6am.

Beyond dietary changes or going on a long term medication, are there any techniques to help the pain in the moment? Tum’s doesn’t really seem to help but I’m curious about gas-x or ovol. Like I said earlier water has been the only temporary relief I’ve been able to find so far.