Electric shock pain on top of knee cap

[cmc216]

I am experiencing random jolting electrifying knee pain on the top of my knee cap.  There is no swelling, no redness.  The pain comes most often when Im sleeping and it's so painful I scream.  The blankets can't even touch it without excruciating pain.  I will add like 20 years ago I tripped and landed on top of my knee cap and it hurt for a good month.  I have not had any issues until now.  I am on my feet all day, but no time to exercise.  This summer I did tons of exercise and ate healthy.  All the problems are flaring up now.