Lingering Effects. Sometimes motion sickness can leave you feeling off-balance for a little while after the journey is over. This is especially common if your trip was particularly long or rough. If this is the case, it should gradually improve over the next day or so.
Inner Ear Issue. There's a chance it could be something else entirely, like an inner ear infection or inner ear inflammation. These can cause dizziness and nausea similar to motion sickness.