Worst hour on a bike...

Momentum Above the neck = keep riding, below the neck = rest. If it's too vague to fit one of these categories then keep riding but take it easy.
I've got a lot of experience riding slowly while I recover from various injuries (it's been that kind of year). Just repeat kind, soothing words to yourself when people overtake you instead of being tempted to race them. It works better with a broken bone than a vague illness, but give it a go.

Yeah, tanks. I know what you're saying. It's hard being a competitive cnut and just giving in. Reminds me of doing base miles.. trying hard NOT to go into the red chasing people down.. it was only this morning that I thought to myself "fsck, this doesn't usually happen, rest+food and still sluggish and unmotivated".. which made me wonder if I'm still fighting off a virus? In these situations I try and force my rides to take as long as possible.. ie. say to myself "right, higher number on the clock at home is better" or "make sure to finish slower than an hour". Even doing stuff like counting traffic lights (seriously!) makes me slow down. I just have to remember to do it! :)

107 traffic lights on my commute btw..