Ask the physicians that you work closely with to give a rec for you. Your nurse manager is almost a requirement for most schools. Unfortunately some ICUs and RNs in general start hating on those wanting to go to CRNA school. This is when nursing rears its sometimes catty and backstabbing ways. These individuals made choices for some reason or another and they can't go to school so they are going to take it out on those who try and make something better for themselves. This is a game that plays out I'm sure across the country.
Here's a alternative method to give you a heads up about what people are saying about you. Say you want to go to schools A and B. Pick some random school (C) that you honestly have no intention of attending. Hand everyone that you want recs from for schools A, B, and C. Obtain these letters of rec and open all letters for school C. You have to assume if someone wrote you a good letter of rec for school C then he or she did the same on the form for school A, but it is a chance you have to take. If someone wrote you a bad letter of rec, then pull all these person's letters for schools A and B. Not that I did this in any way, but something "a friend" of mine told me about...
What may suprise you is that people you think are on your side will actually try to screw you over in a passive / aggressive manner once you read the letters.
Good luck.
Nursing News