Hello I have gone through your question and understand your concern. Firstly, let me enlighten you in brief on hCG diet injection which is a form of natural hormone secreted in pregnancy which have no significant effect on body weight. The use of hCG shots is not approved by FDA for weight loss and the diet hCG diet plan is basically a very low calorie diet plan which may lead to weight loss only by low calorie consumption not by altering the metabolism using the hormone as claimed. hCG hormone release during the process of implantation till the formation of palcenta causes nausea and vomiting in early pregnancy is a known fact. Therefore, injecting hCG will produce similar side effects and once the levels of hCG in body drops the side effects will resolve. It is advisable to stop diet plans which give temporary results instead consult a nutrition and fitness expert to eat and live well. Thank you.