There are a few things you can do to avoid feeling nauseous while shrooming.
First, start with a shallow dose and work your way up.
Second, take some ginger in either tea or capsule form before consuming your mushrooms.
Third, consume shroom tea on an empty stomach. However, eating some light snacks before taking your dose should not be a problem.
And lastly, breathe deeply and relax; nausea will likely pass.