Man I hurt for you, as a fellow midshipman I know I have worked as hard as I could for the past four years on the dream of flying a Naval aircraft, and it sucks that you did the same and it did not work out. I would generally agree with many of the aviators who have posted, pointing out that the needs of the Navy supersede all and your a Naval Officer first, etc. The only thing that upsets me about your case is the countless stories I have heard of the Admiral at the nuke interview this year turning away midshipman that want to be submariners. I know personally three guys who came from a very reputable school (as in top 5 in the nation type university), and all three got turned down when they went to DC. One as soon as he got there reported into the Admiral's Office and was told to the "get the hell out" and that was that.
Now, I am not saying I am better at screening for sub guys than a flag officer who has been doing this for 20-30 years, but it just seems weird that the sub community is turning away guys who really want to be there at the expense of not having enough to fill their quota. It seems to me that a guy is more likely to make it through Nuke school if he wants to be there versus a guy who does not. Anyways, man I hope everything works out for you, try to get your aviation LT to work with you and if he has any connections he should be able to at least get you some good answers.