The primary cause of any GERD or acid reflux is a leaky, relaxed or weakened cardiac sphincter. Only if it leaks will the stomach acid make it up into your esophagus.
If there is a leak, then excess stomach acid can make it much worse. That's why they prescribe things like omeprazole (Prilosec). It greatly reduces acid production. Over many years it can cause side effects so you really shouldn't be using it as a long term daily regimen.
Prilosec is safe for short term use for occasional bouts of GERD but you still need something like Tums until it takes effect. Pepcid AC does much the same thing as Prilosec.
Morning GERD can be helped by the position you sleep in. A sleeping wedge or sleeping on a slight incline uses gravity to keep the acid where it belongs. A smaller meal a couple hours before bedtime puts less pressure on your stomach, so acid is less likely to gurgle up. Because of how the stomach is built, laying on your left side can help.
There are foods that leave you more prone to acid reflux, so avoid them. You can take Tums, or the equivalent, proactively when you go to bed. Stomach acid is VERY potent stuff.