Both my husband and I have worked nights for years by choice. That's the key right there. There used to be a ton of research that concluded that noc shift was potentially harmful. Subsequent studies have revealed a gigantic difference in level of damage between those who work nights against their will and those who choose it.
If nights is not your preference, I'd suggest taking a look at the factors that contribute to that mindset. If you're fighting your own body, that's the hardest to deal with. But if it has to do with other things--child care, social life, old habits--much of that can be altered by changing your thinking.
I have always been a night owl, so working third shift meant I could STOP fighting my own nature and go with the flow, so to speak. Then, because I was happy about having a schedule that felt much better than days or even PMs, I was open to seeing some of the advantages that go with working nights. We shop at odd hours when the stores are quiet. We go out for lunch and an afternoon movie. We're usually driving opposite the worst traffic. It's sort of like living in a parallel universe. We travel the same path as everyone else, and yet we don't.
And we've taken measures to accommodate our weird schedule. Made sure the bedroom was dark, dark, dark. Got the TiVo clone from our cable company so we can watch TV at our convenience. Have learned to be very flexible about what we eat and when. Many more adjustments.
I can't imagine working days. Seriously, I'd want a HUGE shift differential to start coming in at 0700.
If you are able to sort out what it is about night shift that is giving you physical symptoms and stress, you might be able to take an objective look at whether or not you can continue to make it work for you. If you can, there is much to be gained--the aforesaid differentials, easier employability, far less competition for parking, etc. If not, then you know you have to find a way to get on days or PMs.
I wish you well.