Knee problem- any ideas?

Hi suspect this may be more than one problem mixed together but anyway. a few months ago I had quite a bit of pain at the front outside base of my knee, no obvious cause, no bruises, very little swelling. Anyhow problem appeared to be gone.
2 weeks ago I turned sharply playing soccer and the outside rear of my knee is now sore. It was a bit swollen but is ok now, just isnt clearing up although it has improved. I have pain at the back of the knee is I bend it fully. Right now I also have pain around the front bottom of my knee. About a week before I had a slight quad strain, wonder if this might have contributed? base of quad and hamstring both slightly sore
Seems to be worst when lying down, I can run, walk, and play ok although I did get a jolt of pain when I booted the ball a bit hard earlier. Anyhow anyone got any idea if the new injury is related to the old one, what it is and what I should do about it?