Getting burps/indigestion whenever I work on moving my larynx?

Heya! I feel like I'm doing something wrong here. Every time I try doing even like 2 minutes of exercises moving my larynx for brightening my resonance, I have to burp like.. a lot? On the plus side, I only ever train my voice when it's private, so I don't have to worry that I'm sounding unladylike lol. But it still seems like maybe I'm doing something wrong and introducing extra gas into my esophagus somehow? Does anyone have any similar experiences or tips?