My Right Knee Has Been Swollen Above The Knee For

My right knee has been swollen above the knee for a couple of weeks now. I feel no pain mostly pressure and of course when the pressure tops out I feel minor pain and motion is limited to about 3 quarter movement. I can walk on level ground with zero pain all day and the swelling gets worse later in the day. The swelling never completely goes away after sleeping all night. I am 54 and I noticed the start of the problem after getting up from changing a tire. I'm an owner/ operator of a roadside service business and when changing tires I use a knee pad but this one time I thought I felt a slight pulling sensation above my right knee cap and the swelling started over the next few days. as I look down at my knee the swelling seems to be to the upper right part of the knee.