Recovery does not mean losing momentum; sometimes it protects it.

Pausing does not necessarily break a rhythm. Often it is what keeps the rhythm possible, since the alternative is a steady decline in quality followed by a long involuntary gap. What looks like protecting momentum by continuing is frequently the thing that ends it.

If you are afraid to take a day because you will lose your thread, try taking it and noticing what actually happens. Most threads survive a day. Very few survive burning out.