Hi. I Have Diagnostic By H Pylori, GERD, IBS.i Also

hi. i have diagnostic by h pylori, GERD, IBS.i also i have nausea , i I have been prescribed Nexium , domperidone and also colpermin . i had change my doctor and new doctor told me this drugs have interaction together . he prescribed to me nexium , domperidone and TRIFLUOPERAZINE . so I am confused. which prescribed is better? is it realy intraction between dompridone and colpermin ? please help me.