TimeIhadaNameChange Urgh colds are a nightmare generally, I had one in my first week so couldnt tell if it was an actual cold or carb flu!
My advice would be take lemsip capsules etc not the drinks, they do the same job just without the sugar.
Also, if you've been doing this WOE properly the last 4 weeks, a carb binge now is going to make you feel a hundred million times worse so you're better off eating lots of leafy greens, good quality meats and fats to give the rest of your body a break while your immune system focuses on the infection.
For soup you can make tomato soup with mascapone and have it in the freezer. Loads of fat in it for energy while you're sick and very comforting. Also, there's a few covent garden/cully and scully soups that are really low carb and heavenly. Broccoli and stilton is a personal favourite.
There's no such thing as an essential carb, you dont need them and they are not going to make you feel any better. You can get as much vitC from green leafy veg than you can from an orange, but without the sugar. Squeeze lemon juice into hot water for VitC too without the added sugar, add mint leaves and it's lovely as a honey and lemon alternative.
Strepsils etc don't cure colds, all they do is numb your throat for the time you're eating the strepsil. The effect wears off after 20 minutes or so rendering them essentially useless. The sugar in them is going to give you a headache if you're fat adapted so they'll make you feel worse.
Finally and above all, just be kind to your body. GIve it fuel, don't pack it full of junk under the assumption it will make you feel better, it wont. Now more than ever you need your diet to be clean, calorie dense and full of nutrients to help you recover naturally :)