Hi Jialat... I wear Freshkon colorlens before and experienced sharp pain too.
And i stop ''a while'' (around 1 year) and during this 1 year , i change to high-hydrated lens (O2 OPTIX).. and switch back to color-lens again later 1 year.

Now , i wearing color-lens seems no problem for me at all. I guess it is because our eyes need more time to suitable the color-lens..
or maybe the product making is not perfect for the earlier batch.

No, I bought from focus point, should be original one.
really not sure about the root cause for being sharp pain. :s