I don't know how people who keep changing shifts do it either. I worked in a hospital for four years and it's mandated that everyone work two weeks of days, two weeks of evenings, and two weeks of nights. Those were sheer unaldulterated h---. Some folk who'd been there longer than I had made some deals so they only worked nights. At that, at least, they had a regular schedule rather than the flipping around. As far as evenings and days went, of course the senior management staff got to pick the juicy day shifts, and for me, I didn't mind evenings at all, as I had a good sitter for my kids that actually took them places after school, fishing, swimming, tobogganing, etc. So that worked well, but then every month or six weeks those stretches of nights came around. They were awful. I became physically ill. I never could get the hang of sleeping during the day. Do you think there might be someone who would want to trade off, either way? I admire you for keeping your job. I have several other chronic health probs besides the Fibro, and eventually could not keep the happy face, make believe, everything is grade thing going any longer. I went on disability, at least for now. Good luck and take care of you.
You may have personal concerns about this but as the amyltriptilene is so strong and definitely did not work with shiftwork, I take 5 mgs. Valium at bedtime. My sleep seems to be improving.