Food Taste and smell like garbage. It?

I had covid in August and hod gotten treated for it like only crocin it was mild then my taste and smell had gone like nothing whatsoever and after that I started getting taste and smell back like 60 percent and then suddenly I had gotten cold flu in November start for 3 days nose blocked and all I got my blood checked and was negative for covid but then everything is smelling like garbage even tasting j can only eat boiled plain rice and potatoes without any spices . The smell is so bad of any food that I feel like puking and since 2 months I haven't seen any improvement in it . Even if I pass by any hotel or anything on road it smells terrible I can't even put a foot in my house when food is been made or someone is eating it . Is there any cure or any course I need to do for it ?