Breathing heavily, having dry n wetcough

Patient is bedridden since last 3 years and is unable to move his hand and legs since last few months. He is having breathing difficulty since 1.5 months and coughing continuously while eating and drinking. So, we have given antibiotic injections amikacin 500 and tigecyline 50 for 7days twice daily. we have put NG tube for feeding. We did xray and report was patchy opacity in lower right zone- inflammatory) . But still sometimes he coughs severely and is unable to breathe and his oxygen saturation level falls down to 65-85 and pulse rate remains high around 130-150 and respiratory rate is above 30-35. Please advice and help how can we treat him at home as we don't want to take to hospital due to covid fear as outside he is more prone to infection. Also he had severe bed sore which is taking alot of Time to heal. Urine infection is also not getting subsided rather UTi is continuously getting exxagerated more. Patient is unable to talk so he can't say his pain to anyone. Kindly help.