The pain might be due to improper rehab or cold weather or you might be putting too much stress on your knee. If you are not a pro athlete , i suggest you to not to put much stress on your knee. If you are jogging or going to a gym, i suggest you to wear a knee cap while jogging/running. And before doing any exercise do proper stretching and warm up to avoid injuries. And try the regimen i told you in last post.
Recover soon! Good Luck!