Thats what happens. Early on with T every day is bad. Then as time passes, you mix in a good day here and there. But the bad days do return for the most part. Then as more time passes, more good days mix in with the bad days and so on. You will get to a point where you might even have more good days than bad days and some times you regress.
However, one day you won't care as much. I know what is hard to believe at this point but it's true and regardless of if you are having a good (low T day) or bad (high T day), you won't really care that much either way. Sure you prefer the low T day but you will reach a point when even the bad days don't bother you that much and not even close to as much as it did during the early days.