Ginger tea and/or Cannabis.

I feel for you. I have it sometimes also. I have some ginger ale which helps.

I never get nausea now. Here in Canada where Cannabis is legal I use rub for pain and smoke rolled or cartridges on top of doctor meds. Ginger tea is a wonderful drink for me also.

I rarely get a upset stomach, but my tummy would fluctuate for a few minutes then stop for weeks. Even my dentist saw it happen one time.

It's dif per person, I have had a upset stomach but not of my condition of epilepsy, I have gotten sick to my stomach, but from the flu etc, my opinion here