Left Knee Swollen...

My left knee was swollen today.I can't even climb the double-decker bus when I am going to school today.Worse is that it was raining when I am heading for school in the afternoon.I am feeling the pain now.Can't walk much and properly too.So how can I go that Toa Payoh "Xuang Lin Si" temple?Feeling so sad,every year no people got the time to go Chinese Garden and recent years no people even ask me to carry lantern in the park already.