Hi,
Bodyache, fatigue, and weakness are common symptoms of Covid. Moreover, even after your test result is negative and you no longer have Covid, symptoms still persists for few days/ weeks. Due to lost taste, you tend to eat less and constant medicines for several days of treatment tend to make you weak. Hence, I would advice you to concentrate on your diet (including fruits), drink plenty of water (lack of water causes leg ache). Protein diet and
vitamin C would recover you soon. Hot water bath should help to reduce shoulder and back pain. Do not exercise.