Taking a break from rock

The song on my blog is a piano instrumental version of a famous rock song.
Can you recognize this song? I changed song.

Anyways, these long long weekend I have been doing almost nothing fruitful.
Everyday just cooped up at home sleeping or using the computer.

Oh, and seems like there is really something wrong with my left knee.
Although now I can walk quite normally and my knee can bend quite a large angle, there is a sharp pain when I squat or kneel or just using my knee to do some strenous activities.
Yup, I went to the doctor in Yishun Polyclinic and she referred me to Tan Tock Seng Hospital for physiotherapy on the 17th of June.
I seriously don't know what is wrong with my left knee.
From these keywords: X-rays, ligament, degenerative, spiking... Who knows the severity of my left knee injury?

I only want my left knee to get better, then I can do the things that I can do in the past and perhaps more.