Calf muscle and knee pain from4 mnths did doppler, X-ray for lumbar spine and blood test for vit B12 and D3 but evrything is normal also they r weak?

May need more tests. X-rays of the spine are useless unless there is a history of trauma. Vitamin tests do no tell you about your pains. Need more info. Did this occur after an injury, or change in activity? Are there bruises? Do you have corresponding tingling and numbness? It may be from your back, or it may be the knee, or it can be an auto immune thing like rheumatoid disease. Get evaluated.