I would like to know whether you & your father have history of traveling to affected areas or any such important information if you would like to share?  Since you had similar episodes in the past & current history also suggests a similar episode along with infection ( like sinusitis), you might need to continue with your anti allergic medications, antibiotics & paracetamol. usually covid 19 infection resolves by 7th day ,like any other viral flu & if it doesnt or if the symptoms get worse, you need to consult the helpline or go to the nearest hospital to get yourself tested.( as the testing kits are too scarce ) Very happy to know that you both have isolated yourself as be it any infection, isolation is the first key to prevention.

Hi.. Considering your present complaints & considering Pandemic situation It's very important to evaluate you thoroughly to rule out CoVID 19 on priority basis, but will require a detailed history for differential diagnosis. Kindly switch to  Personal consultation chat for further medical assistance