Virus, as usual, is dead on.
The weight you lost was probably 70% water and 30% fat. When you're sick, your body uses fat as emergency fuel, not your muscle. The reason people's muscles deteriorate when hospitalized is simply due to inactivity. In a three day period, your muscles didn't take a lick.
You'll be right back to where you were in no time, but I'd suggest when you get back into the gym, drop your weight a bit until you get your muscles warmed back up. Over the course of a week, creep your way back up to your pre-sickness weight, lifting wise.
As well, stretching is extremely important after being bed ridden for awhile. Give your body a GOOD, THOROUGH stretching before heading out.
Hope you feel completely better soon and make sure to rehydrate!
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