Shall i just ask for the gastric band if the tablets dont help

Hi i went to my doctors yesterday to see if i was able to get any help to try loose some weight as i have tried several diets swimming excercising! Cut out crisps n take aways alcohol and nothing comes off im so depressed about my weight its gross! You would think i eat loads but its totally the opposite, luckily she has given me some tablets called zenecial has anyone tried them and if so how well do you think they work? But She also said to me with my Bmi being so high 48 i should be able to get a band on the nhs! Do you think i should just see if i can get one? and how do they do it will it be much more different than the pain of bein cut for caesarean section Thanks for any advice