pain at calf which increases while standing or walking suggests knee ostearthritis and vitamin d deficiency. you could start with vitamin D 60000IU weekly and gastroenamius & quadriceps muscle strengthening exercises. anagesic such as ibuprofen and diacyrien 50mg once a day will help in reducing inflammation due to ostearthritis. try to avoid squatting and climbing stairs. if symptoms does not subsides in 8-10 days ,then visit to your orthopedician for adding some more medicine according to condition your knee pain. Hope this helps. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.