I can relate to this! A few years ago I worked in a hospital taht merged with another, what a nightmare! It may take soem arguments but tell your colleauges how you fee. Encourage everyone to act like the adults they are meant to be, talk to your NUM no matter how hard it is.Maybe even put down some objectives in writing for you yearly review taht you want to gain more experience in ICU pts. Talking and yes sometiems yelling and tears are the way to go, Sometimes an external facilitator to a frank and open discussion can help. The NUM is probably feeling as frustrated as you. Go higher if neccesary. Good luck