It's the shift work. Shift work will kill you.
My partner is 62. His job isn't shift work but it is stressful. It's killing him. He sleeps with an ice pack on his back from all that sitting. His hand is all curled up with arthritis. He takes drugs to sleep at night. He, of course, thinks this is all normal, but when he got laid off a while ago he was so happy and healthy, like a totally different person.
I have a friend who retired a couple years ago after a lifetime at a stressful job in law enforcement. He didn't even realize the job had been killing him until the withdrawl symptoms hit him. He was very ill for a while. He had the shakes and all kinds of mood problems. He totally fell apart for a while. He feels lucky to have gotten out when he did, soon enough he could recover from the stress and enjoy the rest of his life as a healthy person.
You don't notice how your shift work and job stress can kill you at your age. Let me tell you, it does a lot of damage. Messing up your circadian rhythm messes up your hormones and this will affect all your organs including your skin.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting squat: 45lbs. Current squat: 145 x 4.