Eating pizza and drinking is NOT recommended before ayahuasca. Some people go through very extreme diets for a few days before and after aya session, but personally I feel that if you generally eat light and have some good sense (as in, NOT eating pizza and heavy foods), the problems will be diminished. So fruits, vegetables, quinoa, stuff like this, and dont eat anything for at least a couple of hours before drinking aya.
This doesn't mean it will completely quit the nausea, but it can reduce it. Often nausea can be ayahuasca telling you to take care of your body. Or it can be a way to 'get rid' of other things accumulated in your body and mind. Or when I find no other explanation, I just take it as a reminder of my own mortality, and take the suffering experience as a possibility of growth.
Appart from eating light, you can also try chewing ginger before and after drinking ayahuasca, it could reduce some of the nausea too. Dont drink ginger tea, you need the whole ginger pieces in your stomach since galanolactone, the active nausea-reducing principle, is not water soluble.
Good luck and dont forget to let us know how it goes for you next time
