If any psychiatrist has told that you are suffering from depression and in his examination no other physical illness then in my opinion may be your vomiting may be due to gastritis and you take medicine like rabeprazol with domperidone combination for that and even if vomiting continue then you should require injectable preparation to control your vomiting. For depression mirtazepine is better choice for you. My advise is you consult any nearby psychiatrist and he/she will help you to start your medication after your proper history & workup

It is difficult to comment why you are vomiting continuously. I am not sure what are the constituents of this tablet imopam but it seems like a benzodiazepine. Also it is difficult to comment upon your diagnosis as your description is very brief. I suggest you to visit an emergency room to take care of your vomitings first. Once your general condition is stabilised, visit your psychiatrist for further opinion.