Thanks for providing the additional information.
Well, there are few possibilities for your symptoms. Common causes are-
-Imbalance of electrolyte levels in body.
-Peripheral artery disease.
To make a diagnose, you need to undergo few tests ,these are-
Complete blood count, Blood sugar test, Thyroid hormone test, Ultrasound of legs. Also sodium, potassium, and calcium levels in blood should be checked.
For the time ,you should take vitamin B complex supplements as this may help to manage your symptoms.
Use a cold pack to relax tense muscles, and this will help in relieving pain. After this use a warm towel or heating pad later if you have pain or tenderness, or you can take a hot bath.
Also massaging the leg muscle will help in solving the problem.
You should gently stretch your leg and move your foot towards your knee, until you feel the calf muscles stretch.This will relax your leg muscles.
Also you should formulate an exercise routine and ensure that you build on it gradually.You should avoid alcohol.
Your doctor can prescribe you with muscle relaxing medications.
There is some underlying issue, and with tests, the cause will be evaluated, and you will be advised management accordingly.
I trust I've helped, and please let me know if you have any additional questions or concerns.