It was probably a mild flu, yes. I believe the virus itself is gone by now but I feel very weak and I fear that I will develop pneomonia instead, which happened to me once before, when I "bravely defeated" a hard flu and did not take care of myself enough. (Really stupid, DON'T TRY THIS AT HOME, FOLKS.) When you're ill, you really must take care or it may end up in disaster.
Yeah, you describe it very well - the "edge" is gone.
But somehow this is an interesting experience. As a Swedish proverb says, you don't miss the cow until the box is empty. Now I may be better at understanding what this cow, this musical feeling, really consists of, now when I experience the absence of it.