Malabsorption of food. This desease!

Hi sir I am suffering from loose motion( go for motion one to two times perday..) I also never fill hungry I did the endoscopy ,(large enima and small both)..reports were normal One dr did B12 diffeciency test..found some difficiency and given me 15 injection for 4 month..but I took only 7 injection as it was very painful and I was not recovered from malabsorption ( loose motion) Another Dr suggest me to take Metrogyl 400 I took it for 15 days I was feeling better some time but after stopping the medicine again motion is loose .. Could you please suggest what to do Also is there any medicine that I can take for long time...which can hard my motion Also which can increase my hunger and I can gain some weight (age 26 weight 50 height 156cm) Suffering from motion last 4 yrs Now I used to it but I want to get rid of it because feeling frustrated at this age I am suffering from this desease