Just asked my sister who is struggling at the moment, she said:
Lots of fluids on days off and when home from a shift, she marks how many glasses on an app on her phone as she is out of the habit of staying hydrated and she said it makes her feel quite a bit physically better. Also a multivit everyday.
Peppermint body lotion for legs after a shift (she said to point out it is one of the best feelings in the world)
Headspace app whenever possible, and 15 mins of yoga before work even when it's the last thing she feels like doing and the thought of it sometimes makes her want to cry it really helps her.
Meal prep on days off so the freezer is full of stuff ready to go so not expending extra energy on cooking, but know you have a nice meal every day.
She talks to me sometimes about work and I am always here, but she usually declares chat time work free zone, she said especially with friends it's really great to hear about general life and forget about her job even for a second.
Her DH is absolute gold, and although he works long hours as well in a different sector, he has taken on more around the house and with the DC which she says makes a huge difference because she does not have as much of the mental home load as usual.
She is a very positive person overall, growing up and up until I would say 9 months or so ago, annoyingly and ridiculously so! The kind who would have one leg hanging off and be ah well I still have one left, but she is not the same person at the moment. I really hope once this is 'over' she can come out the other side and be back to herself, but I fear that wont be the case for many.
Please let your family know what you need, tell them, we don't always know the right things to do or say, but we are here.