Weight Loss, appetite los. Suggestion!

My father in law is having loss of appetite and his weight has decreased by 5 to 6 kgs in the past 6 weeks. additionally he keeps complaining of stomach ache. he has had a history of alcohol abuse (nothing for last 2 years) and currently consumes tobacco for 2 - 3 times a day. his blood test findings are as follows: haemoglobin - 5.7 (low) rbc - 3.5 (low) packed cells volume - 22.6 (low) mean corpuscular volume - 64.57 (low) mean corp hb - 16.29 (low) mean corp hb conc. (mchc) - 25.22 (low) rdw - 18.5 (high) platelets - 3.14 (normal) rbc morphology - hypochromia (++) microcytosis (++) anisocytosis (+) pokilocytosis (+) esr is 40 urine shows traces of leukocytes abd squamous epithelial cells lft is normal but serum globulin is little high at 3.8 and albumin:globumin ratio is 0.89 renal function test is normal patient is 54 years old male request your first cut diagnosis and prelimnary treatment suggestion