Thank you for the information.
Your symptoms can be problems with cervical or neck spine.
There can be spondylosis, disc problem or pinched nerve.
This can cause cramp of muscles.
MRI scan can be necessary.
Cramps in different areas involving leg, feet can be due to other causes.
Deficiency of calcium, magnesium, potassium, sodium- vitamins, dehydration etc. are the major factors.
Poor circulation or nerve involvement etc. also can cause muscle spasm.
It can also be present in diabetes, hypothyroid state but you do not have such history.
Zocor can cause muscle pain.
I feel you should get an examination by doctor.
Doctor can advise a few tests depending on clinical findings.
In mild cases treatment usually consists of pain medicines like tylenol.
Application of heat & cold can be helpful.
I hope this information will be helpful.
Please ask if you need any clarification.