What causes cramps in my hands and foot? I'm 55 with atherosclerosis, diabetes, and have had carpal tunnel surgery

See your PCP. The answers given here in this forum are general in nature. For advice concerning your specific condition, you should see your primary care physician for evaluation and your individual diagnosis and treatment options.
Causes of cramping. One of the things that causes cramping is changes in blood chemistry, another is changes in stretching and exercise. People rarely also have conditions that predispose them to cramping, such as myotonic dystrophy. This particular condition often presents in young adult life however.