Talk to General Physician on My Father Is Diagnosed With COVID-19 On 19th Mar. The Symptoms Were Stomach Disorder And Having Fatigue, Mild Fever And Loss Of Energy

He considered this as stomachs disorder initially and avoid solid food Nd was observing precautions. His energy level was not recovered and we went for covid pcr test whi h came positive on 19th Mar. We r monitoring his oxygen and hear rate via oxy meter. His oxygen saturation varies from 94 to 90. He is feeling weaknes and having poor voice. Taking plenty of liquids, vitrum multivitamin and Osnate - D calcium. He is hyper sensitive and using amston 5/80 and vaptor 10 mg tabs. He is in quarantine and facing difficulties in breathing. I consulted online and doctor advised to monitor his oxygen levels. What next step to follow. Pl dvise