Hay doctor. I am bilal 30th years old unmarried. My problem is after masturbation i feeling pain and weakness in knees and ankle . I am also patient of Gerd stomach problem . But i recently recoverd from this problem.I eat some multi vitamin tablets for knees . But my problem is not remove . Can we find this problem from any blood test . If you advice me for blood test . I feels now I have some problem in my blood . Pls give me some good advice . Thanks .