Your complaint seems indicative of spasm in your calf muscles.
Next Steps
You can apply voveron gel on thecalf muscles and apply hot water fomentation for about 15 mins after which do self stretching of the calf and hamstring muscles (present on the back aspect of the thigh).
Health Tips
Do not overstretch. Confirmation sign that you overstretched is worsening of pain accompanied with swelling in the calf.