I had symptoms of low stomach acid for a while also.

Six months into COVID I hadn't experienced anything at all on what would have been 1-2 monthly flare ups. Once I had the realization I put it all together.

When COVID hit I had restarted taking a multivitamin and some extra iodine (which is involved in stomach acid production, as it turns out). I had thought my diet was pretty healthy, but as it turns out there was something I wasn't getting enough of. I still don't know what. But I keep up with it and I don't have symptoms.