No job is worth sacrificing your health for. You could either talk to the boss and see if there is any lighter duty you could do, or look for another job.
Listen to your body and QUIT!!! No job is worth your health!!! If you are old enough to retire do so. Get happy and the body will repair itself.
Start by taking some calcium/magnesium/vitamin D supplements for the muscle cramps. Then take two ginseng capsules a day to help your energy level. Take a melatonin at night so you will get some good quality sleep. Start each morning by drinking two glasses of water, the first one with fresh lemon juice in it. And then, with your newfound energy...call in sick for a day or two and go out there and find another job!
I agree with Mike. I finally realized the toll my job is taking on me. It's time for a change. I have stayed for insurance purposes but the fact is I probably wouldn't have the health problems I have if I didn't work there. Stress is a serious health risk!
Have sex with a umpa lumpa. That fixes everything.
fake an accident and go on the sick