Aha! I am not crazy. Boiler did give up this morning (or sometime during the night). When I wanted to hop into the shower this morning the water was freezing cold. And did not get warmer. Luckily I just needed to restart the boiler (too much software in them now) and then it worked again like a charm. But it's only a matter of time. It just cannot handle heating the water and the rooms. Sigh.
That is all. Just wanted to point out quickly that I am not paranoid ;-)