What can be done about numbness in both hands?

See below. There are several common causes of hand numbness. The most common cause is carpal tunnel, but you may also can neuropathy. See your physician for further evaluation.
Plenty. First, the cause needs to be diagnosed. Most likely you possess carpal tunnel syndrome, which can be readily treated and cured. Other nerves may be involved, so you need exam with a neurologist and perhaps an EMG test.