I feel a discomfort in my stomach after meals, not burning or really painful, but just really uncomfortable.

我吃饭以后就会觉得胃部不适，不是那种‘烧灼’的感觉，也不是最疼，但就是非常不舒服。

youdao

Other common symptoms include arm, neck, jaw, back or upper stomach discomfort, dizziness, change in heart rhythm and sudden cold sweats.

CNN: Heart attacks: What you should know