I've had nausea issues my whole life, until recently.
Causes for me:
Eating foods which are avoid for my blood type
Neem/Azadirachtin in my cannabis
Runaway H.Pylori infection
Lack of CBD?
I cut out the avoid foods and still had nausea issues at times, especially reading in a car. With enough CBD, I can actually read in a car without nausea. Without CBD, just the thought of reading makes me nauseous.
Neem/Azadirachtin always causes nausea for me, and beyond. All I want are hot baths/showers and to stop vomiting. Small amounts cause persistent nausea in the mornings.
The runaway H.Pylori infection would make any digestive issues take longer to resolve. It made aza poisoning issues last for weeks. Once it was resolved, aza poisoning symptoms are much less severe and recede in a few days.
Hope things work out for you, there are a lot of other causes for nausea and I hope what you're doing works.