Here I am a full week later, still coughing and still under the weather. Sandra's comment was exactly right. I have slept a LOT, drunk lots of water, taken Robitussin DM at exact four hour intervals and still I am coughing and feeling out of focus.
I finally decided that I needed to start winding the warp for the large piece of tartan and have begun, slowly. I am double- and triple-checking myself because I don't feel confident about my thought processes, ability to count, etc. And, in the case of a tartan in particular all of that counts. A lot.
I am still going to bed early and sleeping in and hoping to shake this bug. As Sandra noted, it is a lulu!