Having history of Pneumonia
for several times, history of COPD and having diabetes with the current symptoms of night fever with chills suggest he should undergo test to rule out pulmonary tuberculosis
. I do not know which country you are from but the weak lungs and lower immunity due to less hemoglobin
and long standing diabetes makes one prone to get infections which general healthy public can resist. So I hope the test to rule out tuberculosis has been carried out on him. Secondly, having low iron can make his legs very restless, so please get prescription for appropriate iron supplement to ease the symptoms. neuropathic and muscle pain
can be treated appropriately by a diabetologist
and with optimum vit D supplement. I hope he gets relief from his disturbing symptoms with appropriate evaluation and treatment. Do get back for further queries. Good luck.