Final answer:
Dystonia best describes the patient's symptoms of painful cramping and 'freezing up' of hands and feet.
Step-by-step explanation:
This best describes dystonia. Dystonia is a movement disorder characterized by involuntary muscle contractions that cause repetitive twisting movements or abnormal postures. In the case of the patient experiencing painful cramping and 'freezing up' of the hands and feet, it is likely a form of focal dystonia. Focal dystonia affects specific body parts, such as the hands or feet, and can be triggered by certain activities like handwriting or walking.