Hi. Thanks for your query. Noted your history of nasal congestion and diarrhea. You have been tired, sleeping in the day, had flu 3 weeks back, nose is still blocked and recurrent diarrhea. These symptoms look to be due to post-viral secondary infection. I would advise you the following: Get a clinical evaluation by a Doctor, examination and relevant investigations. Nasal decongestant drops along with oral antibiotics, antihistamine, probiotics and the medicines for symptomatic relief and definitive treatment.