The stomach is also connected to the nerves, right?

I originally have a weak stomach, so I try to regularly take and manage with cabbage juice.

When I get stressed, it seems like the feeling of chest tightness worsens.

Is it true that the entire above is closely related to nerves?

Should people with stomach issues also try to avoid stress? ㅠㅠ

I think it makes me more stressed itselfㅜㅜ

I should try to think comfortably, right?