Ilyanoor,
Your experience of burning and feeling of an incomplete void weeks after a cystoscopy describes my experience. They usually start to resolve for me at about 6 weeks, but then return on a random schedule. Not sure how long they could go on, since soon it is time for the next scope or TURBT.
I'm sure at least part of it is in MY mind, as I have been paying very close attention to the plumbing since I was diagnosed. My doc checked it out the first time, found nothing. I have accepted those residual feelings as part of the process.
Pyridium or AZO helps reduce the burning and the amount of attention I focuse there. See if your doc thinks if that would help..
Best,
Jack