As you can imagine I don’t know what happens to you but - I had itches in different parts of my body and even a rash showed up on my ankle. Turns out it was a nutrition issue. Over time you may develop allergies to stuff that you weren’t allergic before (also after sicknesses). It doesn’t mean you won’t be able to eat those things ever again, but you at least won’t for some time.

Consider also dust mites allergy and do extensive cleaning where you sleep and see if that helps.