I have experienced severe pain in both my knees, feels like a sledge hammer coming down on my knees?

I am a 41 year old female. I take medication for blood pressure, a water pill and a statin. My tonsils have been removed and I was diagnosed with vitiligo at age 8.
The past two nights I have experienced severe pain in both my knees. It is a constant pain that I describe as a sledge hammer coming down on my knees. There is no redness and no swelling and I can move without worsening or lessening the pain. The pain will eventually taper off on it’s own, only to return at bedtime. I have had xrays and blood work done and have been advised of nothing to explain what is happening. I have had no injuries and do not participate in sports. I have no prior issues with joints, or my knees. I do walk daily for exercise. I am wondering what could be causing this sudden issue?


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