If you're experiencing any side effects after eating Papaya then you should stop eating the Papaya immediately and talk to your doctor because it can be a serious health issue and means you're likely allergic to the Papaya.
Some side effects that you may experience after eating Papaya are slow heartbeat, nausea, vomiting, severe stomach/abdominal pain, inability to move and severe drowsiness.
If you're not allergic to the Papaya then you should not experience side effects and if you do experience the side effects of Papaya then you shouldn't eat them anymore even though they're healthy and delicious.
I eat Papaya all the time and never had any of these side effects.