Thanks for the details. I would like to say that there is a strong possibility of lower disc disease such as disc collapse or herniation with nerve compression. Sciatica should be rule out. Some times such kind of calf pain can be seen due to clot formation or blood flow obstruction in leg, electrolyte imbalance. In either case, I will highly advise to see your physician or preferably visit ER for early examination & tests which should include x-ray lower back (lumbar-sacral region), doppler scan might be needed, full blood count. Let me know if you have any further question. Best wishes.
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Dr. Amir Javed.