Nutrition - the lemon helps with vit c BUT you need to not be having caffeine and nicotine at the same time as these block absorption
You also need iron (essential for recovery from any ailment to be honest), protein and as wide a range of vitamins and minerals as you can manage to get in.
Eggs are a good source of nutrition especially iron and protein and whenever we were sick as kids one of the things mum would make us to eat was Chucky eggs - boiled eggs mashed in a cup with butter and a little salt maybe some black pepper if you like served with toast (I like marmite on toast with it and marmite is packed with b vitamins which boost energy and help with red blood cell production it also contains iron)
Soup - chicken soup is now known to contain elements which fight many common cold and flu symptoms, I’m veggie though so have veggie soup (the more the merrier for this so use up whatever’s available) but it’s still a good way to get a lot of nutrition into you in a way that feels fairly light and easy to eat and comforting.
Remember iron needs vit c to boost absorption.
Garlic - now known to have antibiotic and antiviral properties. Easy to add to comforting soups and stews, I’m a bit odd and discovered when living overseas the delight of pickled garlic which I can happily eat straight out of the jar but I realise that won’t be for everyone.
Ginger - naturally anti-inflammatory, decongestant and anti-nausea
Hot toddy helps combine some things I make up using honey (anti-viral and antibiotic and anti-inflammatory), Lemon (I’m lazy and use plj always got some in as I like a splash in cold drinks too), ginger (again I’m lazy I get that very lazy ginger in, quick rinse before using in this), a splash of rum and if I have any in a stick of cinnamon.
Put the honey, lemon & ginger in cup first, pour over hot but not boiling water, let steep for a few mins, add splash of rum and cinnamon stick maybe a dash of cold water if still too hot to drink and sip slowly.
I also struggle with sinus issues though (I have an enlarged and deviated septum among other reasons) so I also cut back on dairy if I get a bug.
I also use olbas oil or essential oils like eucalyptus, tea tree, peppermint, Bergamot... depends on exact symptoms. But remember some oils aren’t to be used by/around pregnant women, young babies or pets. Check before using.
Gotta say I eat a lot of garlic and ginger anyway and I’m rarely ill with this type of bug and if I am it doesn’t last long.
But I’m also (ny resolution) taking multivitamin supplement and a vit d supplement (for different reasons but hoping it’ll guard against this too)
I think prevention tends to work better than cure to be honest.
Hope you’re feeling much better soon.