I recovered from a viral infection 15-20 days before only.It had lasted for almost a month.Now I was recovering from it from last 15 days.Yesterday I was cleaning my room and I did it almost for an hour as it was very messy and had lot of dust,than suddenly after sometime I started having cold,my one side of nose is blocked,I am also feeling slight itchiness in my throat.Today morning I came to the office and now I am feeling slight weakness and also slight fever.I have not checked the fever but it feels like I am having.So what can be the possible reason for that?What should I do it cure it?