This may not be the reply you want to read and I am sure there will be other posters who will disagree with me, but if you have not adjusted to night shifts after 2 years, then I think you probably never will.
Also, isn't life too short to sleep through and not spend enough time with your family? Look very closely at your finances/budget and is there nothing that you can adjust/sacrifice to make up for the loss of night shift differential? If you have high car payments, sell it and get a nice, cheaper used one. Do you have satellite/cable with premium channels? Drop the premium channels and change to the basic package. Do you or your husband smoke? Stop, save the cig money. I am sure you will be able to find something.
Keep your eyes open for dayshift positions that open up, because they eventually do become available. It may not be in the unit you want or it may be out of your comfort zone, but make the sacrifice to be with your family.
I worked nightshift for 3 years and never adjusted to it. I was always exhausted, crabby, and felt no energy to do anything on my days off. After 3 years, I went to my manager and requested the next available dayshift opening and was told it would be awhile before that would happen. I went to my employers website to check out open dayshift positions, and saw that a dayshift position was open in the cath lab. I was never interested in the cath lab because I had heard horror stories about the call, the docs, the stress, etc. BUT I called the cath lab manager, interviewed and ended up working there for 5 years and loving it! I took a pay cut, and had to wear a pager on my hip for 5 years but I was home every night with my husband and kids, (except for the occasional call-in for an emergency with double-time for pay), and I was awake and alert, and actually felt human again for the first time in 3 years!
Look back over the last two years and how many of the people you have worked with now work days? If you are working with the same people because no dayshift position has opened up for 2 years, then you should look in another facility.
If you are worried about loss of differential, pick up an extra shift every once in a while! Trust me, with the nursing shortage, you will have no trouble making up that loss of income with a dayshift position!
I guess what I hope you get from my advice is that we have to make sacrifices in life, wouldn't you rather the sacrifice be monetary or material and not your family?
Best of luck to you!