Is there a place that performs good gastroscopy?

Are there any good places in Yangsan, Gyeongnam for gastroscopy?

Lately, I've been feeling very unwell and keep vomiting.

I feel nauseous.

I'm also experiencing a lot of stress.

Lately, I haven't been drinking coffee or milk because my stomach doesn't feel well, and I have been experiencing burning and soreness, so I'm worried and considering having an endoscopy.

Please recommend a hospital if you have any suggestions.