Herbal or Natural Remedies for an Upset Stomach?

I’ve had an upset stomach for the last few days. It has felt like indegestion, then it starts to feel like simple pain bot accompanied with nasuea. I’ve been doing the whole pepto bismal and tums treatment, but it hasn’t helped. Does anyone have an rememdies that doesn’t include these medicines. I really would prefer some natural remedies or even different teas to try. Thanks!