How can we manage potential side effects of treatment, such as nausea, pain, or fatigue, to improve our child's quality of life?

My child has recently started pediatric cancer treatment, and I'm concerned about potential side effects they may experience. I want to do everything I can to help alleviate any discomfort and improve their overall quality of life. If anyone has experience with managing common side effects like nausea, pain, or fatigue in children during cancer treatment, I would greatly appreciate any advice or insights. Are there specific medications, lifestyle adjustments, or complementary therapies that have been effective in reducing side effects for pediatric patients? Our goal is to ensure our child's comfort and well-being while supporting their health journey.