Sudden knee pain

mhasita

So. I usually exercise 6 days per week with videos from fitnessblender's youtube channel.

But last thursday I took my rusty old bike for a ride around town, just 20 minutes. I haven't done any exercise since that day and my knees are killing me, at first it was a slight discomfort and I decided to rest and stop exercising but as the days pass it seems to be getting worse, my knees aren't swollen or anything, but If I walk or bend they hurt.

I already have an appointment to go to the doctor, but I was wondering if anyone has experienced something like this?