Is CBD good for nausea and hunger?

CBD may help, but really microdosing THC might be a better answer for both of those symptoms -- either with inhaling, or with low-dose edibles (5mg or lower). At microdoses, the psychoactivity will be mild. As a guideline, 5-15mg is considered a starter dose for THC edibles; stay on the lower end of that, 5mg or less. Never take edibles with alcohol, and wait a full two hours before taking any more.