I’m not a doctor, so this is not intended to be a substitute for professional medical advice or diagnosis.
But one thing that can cause this from what I have seen is too high an hCG dosage- typically lowering dosage can fix these symptoms. Many clinics dispensing hCG – both brick and mortar and online clinics, prescribe fairly high daily hCG dosages – higher than most people feel best at – please see my main hCG Dosage post for helping on adjusting dosage. Dosage is usually in relation to hunger but as I mentioned, I have seen a number of cases where this symptom occurred and the patients doctor had them lower their dosage.
I hope that helps!