Suffering from Illness and weakness. Do.

Hi, My Uncle is ill for last 5 days, he is feeling back pain and  severe joint pain. Initially, when monitored, blood pressure was low. So we stopped the allopathic medication cuz he was not taking any food but all the regular medicines which led to weakness and fatigue. The symptoms that we are observing include vomiting predominantly cough, mild fever. There are body acne on certain areas. Some tests were suggested so we did get them conducted and there is elevated CRP and ESR , CBC is also done, in which some value are elevated. We are also taking homeopathic treatment. Some relief is observed but it is not permanent and no relief in joint pain whatsoever. He say he can not take solid food so we giving fluids such as milk and a supplement. Sometimes guord juice. Not able to walk, not even few steps on his own due to joint pain. Now the blood pressure is normal. So please suggest us with a proper treatment , medicine as he is heart patients and what should we do.