Welcome to HCM.
You have not mentioned whether you are employed, male or female.
From your description it looks like muscular pain
which may be related to certain jobs, which require a lot of movement of your elbow and knee joints. It does not look like vitamin deficiency
If you exclude joint pain, then most likely it must be muscular pain.
Best is to consult a doctor and let him examine in detail to determine the cause.
Wishing you speedy recovery.