I was treated for covid.19 from april 15 and was under treatment . Still i feel very weak. I joined office on 31st May. But i felt so tired in the evening that i found it difficult to attend office for next 2 days. Body temp. was 97.4. There was pain in my legs. I was feeling feverish. While walking i feel that my left knee is crumbling. I also feel weakness in my chest if i speak with someone for some time. Pl. Advise medicines or type of diet i should take.