Nervous stomach and nausea

I have what you might call a 'nervous stomach'. So when I am under a lot of stress, for example before an important exam or before an important meeting with my superiors, I feel a lot of nausea and typically can't ingest a lot of food/calories. As a consequence I feel tired and can't concentrate as well. This significantly inhibits my performance and well-being. After the anticipated event has started or is over I usually feel pretty normal right away. Are you aware of any behavioral tools or supplements that might help rewire my nervous system to lessen the described effects?

Sleepiness Caused by Sunbathing?

Whenever I'm out in the sun for more than a few minutes, I get extremely sleepy. Is there a fix for this?

How Do You Balance Downtime and Consumption?

When is it acceptable to be working, reading, consuming audiobooks, etc. versus giving your brain a break or dopamine detoxing? Is there a limit to how much an individual can consume in a day?

PEMF, a treatment for depression?

Is PEMF a useful treatment for depression? I found this (https://higherdose.com/products/infrared-pemf-mat) while researching infrared blankets/tubes after watching this episode (https://youtu.be/f20HNxZdGvU?t=1460) of Dr. Rhonda Patrick's Found My Fitness podcast. Is PEMF bogus or the real deal? Thanks for all you do Andrew!

How to stop inner monologue?