Natural remedies

Seen a lot of people on here talking about diet and natural remedies for things, eg foods that can help certain conditions and stuff like that, apple a day, that sort of thing

Does anyone have any tips for me on that? My health, mentally and phsycally has not been great this year. Ever since having covid in January my chest has been quite bad and everything seems to set it off. My asthma has been really bad this year too, I used to be able to play football and run loads but now Im out of breath after a couple of minutes. Often feel lethargic and lacking in energy and achy and my mental health isnt great.

My little boy has terrible asthma too so anything to eat thats good for asthma will help him too

Any ideas for all this would be really welcome