Loss of appetite and severe body pain.

Hi doctor greetings this consultation is for my father 75 yrs old (known alcoholic) one month back he completely lost his appetite and he was having chills and severe body ache visited gastro surgeon nearby and found he has severe GERD and low RBC, haemoglobin medicine given _ (happi D - before food,ulgel syrup and supra +)Now it's has been one month since he quit alcohol but there is no improvements & changes till now he is experiencing severe joints pain and he lost his appetite. Medicine he is having now (supra+,Bayer's tonic,prothaiden, neurobion forte RF injection once in a week) but no improvements please request you to give a suggestion on the same please in such case what should be the next step and whom should we consult please. Thanks & Regards, Vinith