Brief Answer:
Needs work up and management

Detailed Answer:
Thank you for asking

I read your question and i understand your concern. Patient on lithium indicates some psychological disorder like bipolar disorder. Now these racing heart, nausea and vomiting symptoms with sore throat needs to be examined for any infections, like strept throat, malaria , enteric fever as tropical countries like indonesia can be suspected for such causes. He needs complete clinical correlation, work up for the cause and management accordingly. He should pay a visit to a hospital and let them help in this regard.

I hope it helps. take good care of yourself and dont forget to close the discussion please.

Regards
Khan

---