Retire From Running?

The uncomfortable feeling in my right knee makes me quite worry. It becomes worse from one run to another. It makes me hard to decide whether I should go for the Seremban Half Marathon (21KM) which I’ve registered. WeeSeng suggested that I should go for Chinese acupuncture to confirm my knee problem. Today afternoon, I went with him to one of the Chinese doctor he claimed reliable and has helped him cure his leg in the past. And what the doctor said is… I need to rest at least 6 months to actually get back into running. I’ve never thought that I need to retire that early. He further explained that the pain in my knee is caused by the ligament has became loose and not able to hold the joint very well. If I continue to run, the ligament might become overstressed and incurable. Then I’ll have to retire from sports forever! No! Hopefully I can get back to track after 6 months, which is until next year. Have to go for swimming as my main sport until I fully recovered. Anybody interested to join me for swimming?

[update]To runners, good warm-up and regular training may help to prevent this problem. I've never practice those in my past runs...