Ibrutinib/Imbruvica

I have been taking Imbruvica for one year. I have not been sick, though I cannot say I have been well, either. But I am still alive and have not caught any diseases or had a cold. How long will it keep working? Will I have a relapse or go into remission. Tomorrow, the Cancer Doctor. I  like seeing him. It’s the sitting in the waiting room that I cannot deal with.