Hello Friend, Good that you are seeking a help. Nausea is way of expressing discomfort in the body. If you experience that symptoms on any individual, then you may be having a lot of aversion around him and that's triggering such symptoms.
Suggest you to consult Psychologist to evaluate this in detail and suggest suitable solutions.
Next Steps
Feel free to reach out to me online through Practo app chat for further evaluation and recommendation.